Not sure why the numbers are so different. I simply took the product of the yearly GDP growth rates, as reported by the World Bank. My sources: http://data.wor

Not sure why the numbers are so different. I simply took the product of the yearly GDP growth rates, as reported by the World Bank. My sources: http://data.worldbank.org/sites/default/files/countries/en/germany_en.xls http://data.worldbank.org/sites/default/files/countries/en/g... http://data.worldbank.org/sites/default/files/countries/en/japan_en.xls http://data.worldbank.org/sites/default/files/countries/en/j... http://data.worldbank.org/sites/default/files/countries/en/united-states_en.xls http://data.worldbank.org/sites/default/files/countries/en/u...