Year	kg per 2010 US$ of GDP
1964	0.623167608914549
1965	0.638209601909922
1966	0.60434771993191
1967	0.766405104450941
1968	0.722206488478473
1969	0.678258338262631
1970	0.570611325776293
1971	0.574435984215438
1972	0.564150205595739
1973	0.643081307029864
1974	0.553082129869486
1975	0.549628561014315
1976	0.5104652509972
1977	0.497368677900048
1978	0.459264308448614
1979	0.491069883804917
1980	0.466905157577577
1981	0.419229276358535
1982	0.451098110044779
1983	0.427553985728823
1984	0.369843311823765
1985	0.355444843834385
1986	0.370276365328423
1987	0.337287116005077
1988	0.369027286302614
1989	0.308890052122066
1990	0.291585362044066
1991	0.28819221993854
1992	0.298163693716812
1993	0.284186971699257
1994	0.300980552910592
1995	0.262367882811442
1996	0.212793709762971
1997	0.262047637886874
1998	0.254589522501645
1999	0.190071965824075
2000	0.184426437993726
2001	0.183219712334844
2002	0.182399999905319
2003	0.18158905683334
2004	0.172308940342729
2005	0.171394765110612
2006	0.159095049610526
2007	0.123573034804787
2008	0.129046459287846
2009	0.136513917768823
2010	0.132815401840645
2011	0.137298720063025
2012	0.159305701635624
2013	0.163613051962169
2014	0.177854762422915