I think many areas saw a significant fall in prices in the 2009 crash, but some hot areas didn't. Those hot areas are probably 3 times as high compared to 1999, but the areas that were more normal might be closer to 1.86.

Sample of one. The house I once lived in sold for $193K in 1999, I sold it for $300K in 2007 (before the housing crash), it's Zillow estimate fell to $230K in 2010. Today the Zillow estimate is $454K. So that is 2.3 the cost.