Year	kg per 2010 US$ of GDP
1988	0.820961890435495
1989	0.849250623612283
1990	0.643744349829012
1991	0.815510721001861
1992	0.810917737703604
1993	0.791756200963644
1994	0.832258482758562
1995	0.812811077048451
1996	0.747700963089127
1997	0.705316712923143
1998	0.662921248476038
1999	0.63272166638541
2000	0.624138059001446
2001	0.641926747404146
2002	0.629476692947325
2003	0.72368314775544
2004	0.698922955653128
2005	0.661400186441984
2006	0.599853897330768
2007	0.525003123866852
2008	0.567678006808656
2009	0.569556647736597
2010	0.562108542009702
2011	0.596773786682506
2012	0.554784818622667
2013	0.571758841692609
2014	0.583671818389864