Looking at daily and intraday moves over a long period, 2008 has had some of the biggest daily moves, only second to the 1930′s. On a point basis, it has been significant. But from a historical perspective, the recent action does not make a big showing in the Top 25 on a percentage basis.
First is a look at the biggest net point gains and percent moves on an intraday basis:
Next, the best and worst daily net point gains. Notice that there are several during 2011.
Finally, the best and worst days on a percentage basis. The 1930′s takes the award.
Source: The Disciplined Investor