Year	kg per 2010 US$ of GDP
1980	0.133211888114416
1981	0.13643838814326
1982	0.169629725212548
1983	0.135460435986008
1984	0.226886472743178
1985	0.264370319496679
1986	0.208777163781863
1987	0.302819488427123
1988	0.309036887053118
1989	0.163005325715494
1990	0.302678563698309
1991	0.442852195316959
1992	0.489784742112716
1993	0.406987550618933
1994	0.449832105504164
1995	0.492546077876915
1996	0.562640695997276
1997	0.696736024686082
1998	0.639387779363966
1999	0.597806995514489
2000	0.575020859793112
2001	0.516662255097258
2002	0.506600316730763
2003	0.425134130165628
2004	0.327406127719329
2005	0.392961797229842
2006	0.364366469257489
2007	0.308979368537779
2008	0.316966542226859
2009	0.273924685652627
2010	0.307612392841083
2011	0.428743264966875
2012	0.454973790071504
2013	0.50135894584592
2014	0.515674888313923