Year	kg per 2015 US$ of GDP
1990	6.808746854555696
1991	6.719649918815479
1992	5.348246225163656
1993	4.589965990176105
1994	0.9745188770599095
1995	0.8952795752017209
1996	0.7216464241566592
1997	1.071012067074207
1998	1.1636281749353938
1999	1.0383140965810258
2000	1.3070957452491605
2001	1.2586669417336094
2002	1.267403428153526
2003	1.2466556720452995
2004	1.2277055291833334
2005	1.2312602081484527
2006	1.289307650441772
2007	1.2844981833509967
2008	1.338959064059381
2009	1.3690303709631921
2010	1.373945479805901
2011	1.5499590868012991
2012	1.4457482618491286
2013	1.4053252856870235
2014	1.240431420453423
2015	1.1965729425670588
2016	1.3200466431989835
2017	1.297790065715824
2018	1.2457125357664474
2019	1.1309053356248624
2020	1.1562652362594898