$SPX $SPY

The S&amp;P 500 gained 15.5% the past 2 weeks. 

Only other times since WWII that it gained &gt;12% in 2 weeks was October 1974, August 1982, and March 2009. 

One year later the S&amp;P 500 was up 22.9%, 37.3%, and 51.7%, respectively.