The Asian economic crisis of 1997 caused the first (and substantial) drop into negative territory. Afterwards growth overall seems to trend around 5 % per year. A second dip into negative territory occurred with the global crisis of 2008-2009 with negative growth of 2.3 % in Thailand in 2009. Growth in 2010 was measured at 7.8 %, this despite significant policital disturbances.
2011 showed no growth overall due to the flooding at the end of the year.
GDP per capita (current US $) in 2011 was 4,972 US dollar.(World Bank)
The World Bank sets the GDP per capita (PPP method) at 8,646 US Dollars for 2011. (World Bank)