Year	kg per 2015 US$ of GDP
1990	1.2959189138777505
1991	1.3222273421347017
1992	1.3555611734773172
1993	1.2338722893984766
1994	1.1306682099510625
1995	1.1178880225545682
1996	1.1169915978094629
1997	1.1154735923772516
1998	1.1297430159029027
1999	1.1016831261049314
2000	1.0514902340517087
2001	1.094436351266592
2002	1.0990855921714844
2003	1.1986291031804566
2004	1.195915448507316
2005	1.207958818886321
2006	1.2739942074647703
2007	1.2551717724236595
2008	1.1703345550824245
2009	1.1227869496717484
2010	1.1836878536407944
2011	1.2050085154977943
2012	1.1614851437573621
2013	1.2009592461300016
2014	1.168711094276532
2015	1.137417009884404
2016	1.0726714703522164
2017	1.026506970961345
2018	1.038549355722439
2019	1.022943600088318
2020	0.9816184052835286