Year	kg per 2010 US$ of GDP
1975	0.723394403789152
1976	0.688902150805621
1977	0.693397530196435
1978	0.659356955694121
1979	0.629806393102776
1980	0.659067342197048
1981	0.780813809403075
1982	0.780319723703162
1983	0.895281755784641
1984	0.934883327114303
1985	0.923880628269977
1986	0.938203996834147
1987	0.949268165529523
1988	0.932311478921942
1989	1.06789014743824
1990	1.19157580484573
1991	1.10217126044953
1992	1.16275096608529
1993	1.09633809144856
1994	1.17654011612772
1995	1.10173752930386
1996	1.12942007439228
1997	1.11105812081013
1998	1.08808873365437
1999	1.05407093355137
2000	1.07629839659445
2001	1.05506893134456
2002	1.0524555648833
2003	1.04529900415508
2004	1.06042710295174
2005	1.07323732473852
2006	0.995819288947847
2007	0.960352042351997
2008	0.867709597094395
2009	0.843568757753237
2010	0.797717913837981
2011	0.795508333511624
2012	0.874242966110974
2013	0.848279863528469
2014	0.892328851952827