Year	kg per 2010 US$ of GDP
1968	0.605478322127517
1969	0.612271391703494
1970	0.543772766929789
1971	0.543772816979978
1972	0.502118478048262
1973	0.530858929782329
1974	0.489546707090176
1975	0.494854903345879
1976	0.507224529025799
1977	0.517217913464956
1978	0.572458297532144
1979	0.575647787185902
1980	0.58974814016416
1981	0.564647968904321
1982	0.582075755077026
1983	0.637898774451018
1984	0.691236267251956
1985	0.736490882784407
1986	0.777990758774985
1987	0.787396865189111
1988	0.81625473020614
1989	0.820333601564327
1990	0.722707699385394
1991	0.758892103880706
1992	0.770136305907799
1993	0.815906624624095
1994	0.831538671820481
1995	0.790801247358777
1996	0.755280706371519
1997	0.709827805879378
1998	0.746228950930655
1999	0.783116638657201
2000	0.805843688850754
2001	0.80906967060635
2002	0.806415110953945
2003	0.814982858784041
2004	0.815906778775339
2005	0.814956997458981
2006	0.814017971276184
2007	0.768559062507636
2008	0.796027873358482
2009	0.828823077291007
2010	0.820440254812477
2011	0.800500459028861
2012	0.827998190060238
2013	0.798633266966513
2014	0.822904616780497