Im taking the data from macrotrends showing the performance of S&P 500 over 90 years. There is a caveat, it is inflation adjusted so the index for past years like 2000 all the way back to 1930 is readjusted to reflect todays prices?
As per yahoo Finance ....... S&P 500
01/08/2000 was 1438. On 31/8/2000 it was 1517. On 24/12/2018 it was 2351.