Pays 2010 2011 2012 2013 2014 2015 2016
États-Unis10,3710,5610,8412,2511,7412,7112,77
Union européenne (27)5,125,195,024,875,135,024,67
OCDE (Total)6,696,756,697,117,177,477,48
Chine0,230,250,250,310,340,420,49