Year	kg per 2010 US$ of GDP
1981	0.231379041972059
1982	0.203912615806327
1983	0.216611226950539
1984	0.212910016342874
1985	0.199805824363611
1986	0.195660443127694
1987	0.219217023472688
1988	0.283000605694556
1989	0.28190145273369
1990	0.318077076131899
1991	0.37006994879168
1992	0.269755985792033
1993	0.314780090801248
1994	0.326006703329265
1995	0.326912397345392
1996	0.264017656859073
1997	0.33989852318148
1998	0.294135039918526
1999	0.353930272305195
2000	0.296739910055575
2001	0.264390959542924
2002	0.298259011761563
2003	0.333828397656202
2004	0.314067819948749
2005	0.319482004044231
2006	0.363659208951305
2007	0.336099299520395
2008	0.347026955849913
2009	0.370097363698007
2010	0.317587823207521
2011	0.270359440466015
2012	0.277544097001521
2013	0.306241657576427
2014	0.319379697080701