hello , I have yearly(from 1996 to 2020) dataset of uncertainty trade, I want to change them to quarty. I do not know how can I change them


Code:
year    ifscode    TOTAL_EXPORT    TOTAL_FEMI_WUI    TOTAL_FEMI_WTUI    TOTAL_FEMI_WPUI
1996    111    2688.4897    .4768209    .6422272    0
1997    111    2702.883    .44109062    .92838921    0
1998    111    2691.5024    .56860159    .73444997    0
1999    111    2683.0499    .49004398    .3922428    0
2000    111    2758.0046    .49383768    .21572765    0
2001    111    2765.9453    .59066116    .81061781    0
2002    111    2767.7193    .58362088    .39849627    0
2003    111    2778.2356    .67164928    1.0529914    78.478203
2004    111    2814.4469    .56433164    .94809368    .70951504
2005    111    2830.268    .5797765    1.0367063    .12410155
2006    111    2852.9251    70.330962    .79398338    0
2007    111    2883.1674    .54233374    .91129094    .2814356
2008    111    2905.8298    .53068257    .24089033    0
2009    111    2883.5599    .55331383    .4161697    .08301718
2010    111    2898.4286    .61068307    .21916081    0
2011    111    2930.6674    .70502109    .41291227    0
2012    111    2930.6178    .90174509    .43364094    0
2013    111    2933.865    .89761767    .51041857    0
2014    111    2935.177    .77952255    .50253813    .55859619
2015    111    2907.635    .94171026    .6837317    1.3969428
2016    111    2901.2678    1.1038574    1.3742584    .42064388
2017    111    2910.6786    .98149167    2.6498462    .35275824
2018    111    2923.9341    .82349569    5.9764663    .06715999
2019    111    2921.9981    1.0867504    18.064438    .24760621
2020    111    2898.6857    1.0954977    4.8626783    68.6099
I hope I could receive your guideance so soon. thank you so much.