These are annualized returns since 1975. If you look at the data you see hardly any red but plenty of years with crazy high returns. So the corrections are small compared to the run ups. Infact, 2013 return was 26% and 2016 return was 23%. Since 2009 only 2015 has been negative.
On average, bull markets have returned 145% and lasted nearly 4 years. The longest bull market was during the 1990s, when the S&P 500 returned 526%. Unlike bull markets, bear markets, on average, are much shorter. The average bear market has seen losses of 23% and has lasted 14 months. Two out of the three worst bear markets have happened since 2000 (stocks fell 43% from 2000-early 2003 and the market declined 51% from 2008-2009).
