30-40% annually increasing in china is pretty common in recent years, but it's only been happening here in 1 or 2 years, the momentum is losing now, as you did the math for china, annual gaining of avarage real estate price here in 3 years (2004-2007), which is the peak in the history, is about 20%. let me show you the data in shanghai, avarege price in 2000 was 3326yuan/m2, 10327 in 2005, end up about 40% increase annually, moreover the trend and momentum in any medium to large cities in china are still keeping going there.