OK, here's 2008 with a 55% retrace, there's plenty more. Just goes to show you how fake news can be accepted so easily by those you would think are above it. http://stockcharts.com/c-sc/sc?s=%24SPX&p=D&st=2006-03-21&en=2009-08-05&i=p42390163052&a=1228569265&r=1660593607868&r=1660593982175