Year	kg per 2010 US$ of GDP
1960	0.437281306479714
1961	0.461946098273582
1962	0.467691891990665
1963	0.495084106066961
1964	0.476220498219915
1965	0.48459704074965
1966	0.472878400869307
1967	0.477554506590273
1968	0.485253540374754
1969	0.482181195104753
1970	0.459755253262099
1971	0.463243979714754
1972	0.446635561799047
1973	0.447992423912418
1974	0.45859359364303
1975	0.4410178698196
1976	0.446831365924415
1977	0.443240508140228
1978	0.432808116901425
1979	0.437814440100943
1980	0.419893145022252
1981	0.411495882294638
1982	0.420977662406546
1983	0.446363444285575
1984	0.427792573690903
1985	0.409806912312536
1986	0.39303552677329
1987	0.383538980856155
1988	0.382854880796575
1989	0.375780768980354
1990	0.38812712105178
1991	0.379074990273856
1992	0.39577323252227
1993	0.387488901887842
1994	0.386499281196443
1995	0.324122110182905
1996	0.322457266780977
1997	0.334333867349716
1998	0.337904903885665
1999	0.302133280629139
2000	0.300880872508548
2001	0.287485594627199
2002	0.277410774341983
2003	0.275392603425911
2004	0.250747033085432
2005	0.26502134138054
2006	0.256319021141118
2007	0.237947086647551
2008	0.251326736424676
2009	0.265010975356902
2010	0.266248233317628
2011	0.249147894774866
2012	0.250508642652367
2013	0.268553812705673
2014	0.240596984520624