Year	kg per 2010 US$ of GDP
1980	0.293516954760753
1981	0.284931358523212
1982	0.283210066704349
1983	0.286311333454482
1984	0.289447939397373
1985	0.297402718692799
1986	0.290056852513639
1987	0.292894812623044
1988	0.300062191454192
1989	0.292144887919661
1990	0.289616490293178
1991	0.281997166137545
1992	0.289291948728938
1993	0.288069283117274
1994	0.289810618745733
1995	0.330515886095679
1996	0.322248728149659
1997	0.314881556453983
1998	0.295481739062014
1999	0.30695253659295
2000	0.310513375066351
2001	0.318653714050589
2002	0.32164555541526
2003	0.318133008334666
2004	0.344780696145631
2005	0.329463588017691
2006	0.331413532071387
2007	0.322371958887918
2008	0.318423199108948
2009	0.329252883556201
2010	0.339896948054881
2011	0.346927253042742
2012	0.33858775217092
2013	0.346966755293166
2014	0.359447118810128