I would like to find a source for GDP by economic sector *but* have
the sector groupings be between 10 and 20 in number.  There are a
number of GDP by sector lists that group GDP into three or four
sectors - this is not detailed enough for my project.  My first choice
would be to get this data for the "developed world" as defined by MSCI
(see http://www.msci.com/equity/index2.html) but I would accept
aggregate data for a group of countries similiar to the list provided.