Year	kg per 2010 US$ of GDP
1970	0.952621505790787
1971	0.921248722399969
1972	0.932247185997588
1973	0.970573693621558
1974	0.983141036936463
1975	1.06088765928189
1976	1.01213012268314
1977	1.00553439243703
1978	0.984608414725935
1979	1.00648026666726
1980	1.04737979658274
1981	0.912696772143907
1982	0.884127748988031
1983	0.748661655975929
1984	0.733242334505591
1985	0.721150614587203
1986	0.742360124524382
1987	0.769356560742671
1988	0.778643236226935
1989	0.775611896591032
1990	0.745629847332416
1991	0.74391164721265
1992	0.886205027879908
1993	0.977420884998115
1994	1.06518404950631
1995	0.828849485608048
1996	0.807080165731276
1997	0.716962240912721
1998	0.711456963539753
1999	0.692757061517744
2000	0.673480388938188
2001	0.636909160631091
2002	0.643703846585531
2003	0.60579966194859
2004	0.561953264969611
2005	0.525577759140974
2006	0.494251510391062
2007	0.450492509176552
2008	0.49159818059918
2009	0.47586891936896
2010	0.59655445529163
2011	0.544194414187765
2012	0.530743757152268
2013	0.497167229723103
2014	0.492531470517646