Year	kg per 2015 US$ of GDP
1990	0.2372077763370318
1991	0.23882601780468318
1992	0.2613403628598671
1993	0.4633891470702397
1994	0.5573299969443771
1995	0.5455989468573428
1996	0.5833824502559534
1997	0.5689148093390467
1998	0.564042312537122
1999	0.579828474287909
2000	0.517630452102619
2001	0.4891272755122502
2002	0.4231363067987117
2003	0.4390100943217251
2004	0.4119398831958452
2005	0.32441620179194497
2006	0.30457324029408966
2007	0.27372526477568176
2008	0.27972979257601976
2009	0.30424699875940087
2010	0.3142594085072134
2011	0.31789068402133264
2012	0.2929001439375488
2013	0.3152107135262146
2014	0.33028816045809983
2015	0.349725434694882
2016	0.3348479315000957
2017	0.2847244396608196
2018	0.2720915502189186
2019	0.2826580773374896
2020	0.24342378548571797