Year	kg per 2015 US$ of GDP
1990	1.1778281802781332
1991	1.1788651428147805
1992	1.1588539046147976
1993	1.1252614513884454
1994	1.079159997668284
1995	1.0860326028724792
1996	1.0393478439987658
1997	0.9992258725889968
1998	0.9815581085959771
1999	0.9451830015071351
2000	0.926960181847508
2001	0.9221849789980523
2002	0.9147498178946015
2003	0.9353241114303427
2004	0.9397783946677691
2005	0.9400178090835005
2006	0.927451603743811
2007	0.9034339110122008
2008	0.8786661791481319
2009	0.8767115285974286
2010	0.874285991683604
2011	0.8776987067834119
2012	0.8576189112460711
2013	0.8380612600424129
2014	0.8096788780981626
2015	0.7677244925460177
2016	0.737102098233152
2017	0.7178351886979434
2018	0.71104750655755
2019	0.6918240202749631
2020	0.6849722930960644