Sensex is the oldest index in the Indian stock market. When people look at historic returns, they first look at the returns of Sensex from 1980. The Sensex Index has given tremendous returns since 1980. In 1980, Sensex was close to 150 and in 2020 Sensex is near 40000. This gives an indication of how in the long run investors can make a lot of money from the stock market if they just stick to the investments in the long run!