From The Economist:

As house prices in America continue their rapid descent, market-watchers are having to cast back ever further for gloomy comparisons. The latest S&P/Case-Shiller national house-price index, published this week, showed a slump of 14.1% in the year to the first quarter, the worst since the index began 20 years ago. Now Robert Shiller, an economist at Yale University and co-inventor of the index, has compiled a version that stretches back over a century. This shows that the latest fall in nominal prices is already much bigger than the 10.5% drop in 1932, the worst point of the Depression. [Emphasis mine.] And things are even worse than they look. In the deflationary 1930s house prices declined less in real terms. Today inflation is running at a brisk pace, so property prices have fallen by a staggering 18% in real terms over the past year.

The bigger they come

Source:
Through the floor
The Economist
May 29th 2008