Year	kg per 2015 US$ of GDP
1990	1.2976272174935661
1991	1.2778157235072511
1992	1.2288586903569052
1993	1.176749865983412
1994	1.1091411630868802
1995	1.115242344512848
1996	1.0576727735091354
1997	1.0065257844897832
1998	0.9924237079316004
1999	0.9499487562361456
2000	0.937933403533682
2001	0.9371077446421685
2002	0.9308389866900114
2003	0.9655772960295531
2004	0.9787220288098085
2005	0.9850308800695698
2006	0.9737742732326972
2007	0.9449482904987191
2008	0.9141382029657267
2009	0.9041538342397388
2010	0.902342401773937
2011	0.907651910902435
2012	0.8794143752446111
2013	0.8573757927755957
2014	0.8199483673923883
2015	0.7740648359973397
2016	0.7394143265760422
2017	0.7177844982738004
2018	0.7097334259584613
2019	0.6936379139760199
2020	0.6909316647942211