Year	kg per 2010 US$ of GDP
1990	1.62541971467433
1991	1.71588560388647
1992	1.64186591209233
1993	1.57604102650877
1994	1.41511889527129
1995	1.36371301886347
1996	1.32894407395136
1997	1.22644986438379
1998	1.09154014290024
1999	1.01199371848111
2000	0.917489995421637
2001	0.912222995307758
2002	0.874831471269451
2003	0.865993439705647
2004	0.829587675900168
2005	0.796639241845629
2006	0.790952045578182
2007	0.728151901228433
2008	0.699748690876526
2009	0.643309882866661
2010	0.6598162361358
2011	0.629749848943579
2012	0.5864169270098
2013	0.58289225163345
2014	0.533303793947043