Year	kg per 2010 US$ of GDP
1960	0.631751307109097
1961	0.615504110814429
1962	0.607229963127519
1963	0.608212941772802
1964	0.599379019127573
1965	0.592170626038002
1966	0.583089582130831
1967	0.5817583723425
1968	0.577133090837688
1969	0.579345660780457
1970	0.613547996668342
1971	0.602073981398005
1972	0.598665389861705
1973	0.592473724775707
1974	0.573047810378683
1975	0.554544032744792
1976	0.55695662958182
1977	0.548094366870202
1978	0.539400276041576
1979	0.532559586588366
1980	0.513535752842892
1981	0.484127303696306
1982	0.466608619934773
1983	0.450923826110289
1984	0.442189839601319
1985	0.430838858654211
1986	0.418181436729421
1987	0.416732854333752
1988	0.411242338075542
1989	0.40790997222193
1990	0.386395841737549
1991	0.384211651852254
1992	0.37917130911784
1993	0.378238578620833
1994	0.371629650417911
1995	0.366401272798593
1996	0.366076922022991
1997	0.357666454251796
1998	0.347610189061454
1999	0.340551394031527
2000	0.335965114626075
2001	0.330060258641743
2002	0.326667447036701
2003	0.325311501859126
2004	0.318836177945957
2005	0.310743701224219
2006	0.301201666318135
2007	0.29616031487852
2008	0.290216588739112
2009	0.282417846044309
2010	0.283030752940335
2011	0.274122020409777
2012	0.266621082621859
2013	0.262462414449733
2014	0.25465369047818