The NYT has a useful visualization of S&amp;P 500 returns over various periods since 1920:<p><a href="http:&#x2F;&#x2F;www.nytimes.com&#x2F;interactive&#x2F;2011&#x2F;01&#x2F;02&#x2F;business&#x2F;20110102-metrics-graphic.html" rel="nofollow">http:&#x2F;&#x2F;www.nytimes.com&#x2F;interactive&#x2F;2011&#x2F;01&#x2F;02&#x2F;business&#x2F;20110...</a>