The following code plots what I want.
Code:
twoway line listed_domestic year || bar mcap_bil_usd year, yaxis(2) barwidth(.75)
How do I make the line plot visible over the bars?

In the plot, blank space is shown from 1970-1974 since data is available from 1975. How do I remove that blank space i.e. start the graph from 1975?

Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input long year double(listed_domestic mcap_bil_usd)
1975 3422   194.100171148777
1976 3428 157.19968158006668
1977 2877 139.13697683811188
1978 3288 236.03695690631866
1979 3171 234.20436120033264
1980 3241    231.95478951931
1981 3244  196.1764224767685
1982 3170 185.80165040493011
1983 3111  224.0923033952713
1984 3218   270.100231051445
1985 3193  461.6768672466278
1986 3324   807.946816444397
1987 3475  816.0708112716675
1988 3249  1026.451008796692
1989 3275 1441.8436336517334
1990 3316 1409.0109004974365
1991 4278 1597.3958539962769
1992 4096 1395.0458869934082
1993 4379 1781.5791530963033
1994 3800  2103.305383119732
1995 5085 2634.7207982726395
1996 5322 3227.5260013584048
1997 5824 3991.5663554668427
1998 5639 3499.5871432870626
1999 6363  5302.511682383716
2000 6855  5538.939034000039
2001 7626  4547.681827552617
2002 7442 3682.3636319358193
2003 7284  5292.589614300814
2004 3883  6059.987166102976
2005 3499  6323.672760486603
2006 7036  8596.499108314514
2007 7550 10511.337663650513
2008 7584  5191.032473564148
2009 7341 6900.2222266197205
2010 7190  6705.177469730377
2011 7308  5601.655090332031
2012 7144  6332.388786554337
2013 7107  7978.493138551712
2014 6810  7227.137099504471
2015 6655  6313.031332492828
2016 5653  2956.075694322586
2017 5167 3861.1491498947144
2018 4989 3040.0976524353027
end