I'm working with trade value data for all countries and need to compute it's ratio to GDP.  COMTRADE notes say that trade value is reported in U.S. dollars.  But is this current U.S. dollars, U.S. dollars for the year that the commodity trade value data is reported for, or for some base year? 

I have a question concerning the quantities in COMTRADE. We are working with the data taken from HS92 nomenclature for the 1995-2005 period. We have calculated unit values (the ratio “values over quantities”) for all products, all years and some countries of interest (China, USA, European Union, etc) and we compared the results. We made some ...