This year, SPX is up 8.84% compared to Nifty50 up 4%. Nifty50 is plotted in USD currency so that the comparison makes more sense.
If you also look at the price actions, both the charts are showing good correlation. It will be interesting to find out how Nifty50 will close the 4.84% gap.
USDINR is up 0.59% year to date.