S&P 500 Up 28% in 6 Months — What Happens After?

From 10/3/11 to 4/3/12 the S&P is up 28.58%. Since 1927 the S&P has gone up at least 28% in 6 months on 20 other occa­sions. The aver­age change over the next one, three and six months is positive.