Year	kg per 2010 US$ of GDP
1968	0.379017141840153
1969	0.43354320178024
1970	0.350599071257638
1971	0.384177145690258
1972	0.367564828299991
1973	0.40034630720671
1974	0.357672437222112
1975	0.331305724861987
1976	0.342652049962764
1977	0.372340830960368
1978	0.382728653955681
1979	0.410291905980726
1980	0.476246173519557
1981	0.483955876026447
1982	0.549982659986355
1983	0.667405437149336
1984	0.676845685421663
1985	0.831955090841382
1986	0.843701903238799
1987	0.841124507499212
1988	0.78983896409145
1989	0.798474022052725
1990	0.632139884461109
1991	0.792120105868307
1992	0.812287595276975
1993	0.905091679754667
1994	0.883266666031992
1995	0.673038595931124
1996	0.721523764026697
1997	0.59639791830227
1998	0.556685488817221
1999	0.630758868145411
2000	0.783008957492845
2001	0.793349287191217
2002	0.896549005917059
2003	0.808081080234793
2004	0.905320531406966
2005	0.861439889312046
2006	0.91204127695968
2007	0.802458773649121
2008	0.837833251296134
2009	0.932586251057274
2010	0.981606835347947
2011	0.860358630755513
2012	0.922263754882411
2013	0.860192699642254
2014	0.921911118036502