The chart below compares international tourist arrivals data and future forecasts from ASEAN, the WTTC and PATA from 2009-2014. As the chart shows, historic arrivals data falls within a relatively narrow range of +/- 2.5 million tourists per annum, but their future predictions deviate largely, with the WTTC consistently coming up as the most conservative forecaster and with PATA being the most bullish.