Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input str55 Country str244 Sex str11 Age str31 Education str22 Survey str19 Type_of_Source str17(y1998Q1 y1998Q2 y1998Q3) str6 y1998Q4 str17(y1999Q1 y1999Q2 y1999Q3 y1999Q4)
"Portugal" "Total (Sex)" "15+ (Age)"   "Basic (Aggregate levels)"        "EU Labour Force Survey" "Labour force survey" "6.1"  "4.8"               "4.6"               "4.7"  "4.8"               "4.6"               "4.2"               "4.3"              
"Portugal" "Total (Sex)" "15+ (Age)"   "Advanced (Aggregate levels)"     "EU Labour Force Survey" "Labour force survey" "3.7"  "2.8"               "4.1"               "3.6"  "3.4"               "3.3"               "4.7"               "4"                
"Portugal" "Total (Sex)" "15+ (Age)"   "Intermediate (Aggregate levels)" "EU Labour Force Survey" "Labour force survey" "7.8"  "5.8"               "7.1"               "7.4"  "7.1"               "6"                 "5.3"               "4.9"              
"Portugal" "Total (Sex)" "15+ (Age)"   "Total (Aggregate levels)"        "EU Labour Force Survey" "Labour force survey" "6.1"  "4.7"               "4.8"               "4.9"  "4.9"               "4.6"               "4.4"               "4.4"              
"Portugal" "Total (Sex)" "25+ (Age)"   "Advanced (Aggregate levels)"     "EU Labour Force Survey" "Labour force survey" "2.9"  "2.6"               "3.1"               "2.6"  "2.4"               "2.4"               "4"                 "3.5"              
"Portugal" "Total (Sex)" "25+ (Age)"   "Basic (Aggregate levels)"        "EU Labour Force Survey" "Labour force survey" "5.1"  "4"                 "3.9"               "4"    "4"                 "3.9"               "3.6"               "3.7"              
"Portugal" "Total (Sex)" "25+ (Age)"   "Intermediate (Aggregate levels)" "EU Labour Force Survey" "Labour force survey" "6.1"  "4.5"               "5"                 "4.9"  "5.5"               "5.2"               "3.9"               "3.7"              
"Portugal" "Total (Sex)" "25+ (Age)"   "Total (Aggregate levels)"        "EU Labour Force Survey" "Labour force survey" "5"    "3.9"               "3.9"               "3.9"  "4"                 "3.9"               "3.7"               "3.7"              
"Portugal" "Total (Sex)" "15-24 (Age)" "Advanced (Aggregate levels)"     "EU Labour Force Survey" "Labour force survey" "13.2" "4.9"               "16.1"              "14.4" "14.6"              "14.4"              "14.9"              "9.699999999999999"
"Portugal" "Total (Sex)" "15-24 (Age)" "Basic (Aggregate levels)"        "EU Labour Force Survey" "Labour force survey" "11.7" "9.6"               "9.199999999999999" "9.6"  "9.4"               "8.9"               "8"                 "8.199999999999999"
"Portugal" "Total (Sex)" "15-24 (Age)" "Intermediate (Aggregate levels)" "EU Labour Force Survey" "Labour force survey" "13.2" "10.3"              "14.4"              "15.4" "12.8"              "9.1"               "10.1"              "8.9"              
"Portugal" "Total (Sex)" "15-24 (Age)" "Total (Aggregate levels)"        "EU Labour Force Survey" "Labour force survey" "12"   "9.5"               "10.4"              "10.9" "10.3"              "9.199999999999999" "8.699999999999999" "8.4"              
"Portugal" "Total (Sex)" "15-64 (Age)" "Advanced (Aggregate levels)"     "EU Labour Force Survey" "Labour force survey" "3.7"  "2.8"               "4.2"               "3.7"  "3.4"               "3.4"               "4.8"               "4"                
"Portugal" "Total (Sex)" "15-64 (Age)" "Basic (Aggregate levels)"        "EU Labour Force Survey" "Labour force survey" "6.4"  "5"                 "4.8"               "5"    "5"                 "4.8"               "4.4"               "4.6"              
"Portugal" "Total (Sex)" "15-64 (Age)" "Intermediate (Aggregate levels)" "EU Labour Force Survey" "Labour force survey" "7.8"  "5.8"               "7.1"               "7.4"  "7"                 "6"                 "5.3"               "4.9"              
"Portugal" "Total (Sex)" "15-64 (Age)" "Total (Aggregate levels)"        "EU Labour Force Survey" "Labour force survey" "6.3"  "4.9"               "5"                 "5.2"  "5.1"               "4.8"               "4.6"               "4.5"              
"Portugal" "Male (Sex)"  "15+ (Age)"   "Advanced (Aggregate levels)"     "EU Labour Force Survey" "Labour force survey" "3"    "2.2"               "3"                 "2.8"  "2.5"               "3.6"               "3.7"               "3.4"              
"Portugal" "Male (Sex)"  "15+ (Age)"   "Basic (Aggregate levels)"        "EU Labour Force Survey" "Labour force survey" "4.9"  "3.9"               "3.6"               "3.8"  "4.1"               "4.2"               "3.9"               "3.8"              
"Portugal" "Male (Sex)"  "15+ (Age)"   "Intermediate (Aggregate levels)" "EU Labour Force Survey" "Labour force survey" "6.2"  "4.5"               "5.5"               "5.7"  "5.2"               "4.8"               "4.4"               "3.8"              
"Portugal" "Male (Sex)"  "15+ (Age)"   "Total (Aggregate levels)"        "EU Labour Force Survey" "Labour force survey" "4.9"  "3.9"               "3.8"               "4"    "4.1"               "4.2"               "3.9"               "3.8"              
"Portugal" "Male (Sex)"  "25+ (Age)"   "Advanced (Aggregate levels)"     "EU Labour Force Survey" "Labour force survey" "2.5"  "1.8"               "2.4"               "2.3"  "2"                 "3"                 "3.4"               "3.5"              
"Portugal" "Male (Sex)"  "25+ (Age)"   "Basic (Aggregate levels)"        "EU Labour Force Survey" "Labour force survey" "4.2"  "3.2"               "3"                 "3.2"  "3.4"               "3.7"               "3.5"               "3.4"              
"Portugal" "Male (Sex)"  "25+ (Age)"   "Intermediate (Aggregate levels)" "EU Labour Force Survey" "Labour force survey" "5"    "3.4"               "4.5"               "3.9"  "4"                 "4.2"               "3.3"               "2.8"              
"Portugal" "Male (Sex)"  "25+ (Age)"   "Total (Aggregate levels)"        "EU Labour Force Survey" "Labour force survey" "4.1"  "3.1"               "3.1"               "3.2"  "3.3"               "3.7"               "3.5"               "3.3"              
"Portugal" "Male (Sex)"  "15-24 (Age)" "Advanced (Aggregate levels)"     "EU Labour Force Survey" "Labour force survey" "12.9" "9.300000000000001" "13.6"              "12.5" "13.6"              "18"                "6.8"               "2.7"              
"Portugal" "Male (Sex)"  "15-24 (Age)" "Basic (Aggregate levels)"        "EU Labour Force Survey" "Labour force survey" "9.1"  "8.300000000000001" "7.3"               "7.5"  "8.300000000000001" "7.5"               "6.2"               "6.6"              
"Portugal" "Male (Sex)"  "15-24 (Age)" "Intermediate (Aggregate levels)" "EU Labour Force Survey" "Labour force survey" "10.7" "9.199999999999999" "10"                "13.3" "10.2"              "7.4"               "9.199999999999999" "7.4"              
"Portugal" "Male (Sex)"  "15-24 (Age)" "Total (Aggregate levels)"        "EU Labour Force Survey" "Labour force survey" "9.4"  "8.5"               "7.8"               "8.5"  "8.699999999999999" "7.7"               "6.7"               "6.6"              
"Portugal" "Male (Sex)"  "15-64 (Age)" "Advanced (Aggregate levels)"     "EU Labour Force Survey" "Labour force survey" "3.1"  "2.2"               "3"                 "2.9"  "2.6"               "3.6"               "3.7"               "3.5"              
"Portugal" "Male (Sex)"  "15-64 (Age)" "Basic (Aggregate levels)"        "EU Labour Force Survey" "Labour force survey" "5.1"  "4.1"               "3.8"               "4"    "4.3"               "4.4"               "4.1"               "4"                
"Portugal" "Male (Sex)"  "15-64 (Age)" "Intermediate (Aggregate levels)" "EU Labour Force Survey" "Labour force survey" "6.3"  "4.6"               "5.5"               "5.7"  "5.1"               "4.8"               "4.4"               "3.7"              
"Portugal" "Male (Sex)"  "15-64 (Age)" "Total (Aggregate levels)"        "EU Labour Force Survey" "Labour force survey" "5.1"  "4"                 "4"                 "4.1"  "4.3"               "4.4"               "4.1"               "3.9"              
end
How do I make the data set long? I would like to generate a Year variable and keep other variables intact.