Vanguard's Total Stock Market Index Fund is up 163% since the March 2009 low of 16.43.
On the day Lehman Bros. failed in September 2008, VTSMX closed at 29.24 but proceeded to fall from there another 44% into 2009 despite the passage of TARP in early October 2008, and despite massive short-term discounted loans to just about the whole world by the US Federal Reserve Bank denominated in the trillions of dollars throughout the period.
From the 2007 high to September 15, 2008 this fund had already fallen from 37.80 or nearly 23%. The total decline of the fund from the 2007 high to the March 2009 low was nearly 57%.
A decline of that magnitude from today's new high would land the fund back at 18.81.