Year	kg per PPP $ of GDP
1990	1.1906195292183288
1991	1.1910259170773307
1992	1.1330768653976915
1993	1.071303142164653
1994	0.9861285962396648
1995	0.9218495634882959
1996	0.9070835662739222
1997	0.849988793113254
1998	0.7650093756643765
1999	0.7005410085607764
2000	0.6541766046835286
2001	0.6213352433993342
2002	0.5664883774720264
2003	0.5595025442108359
2004	0.5127091184069946
2005	0.48431991912262107
2006	0.447357171811644
2007	0.4053381203615811
2008	0.3583487356849781
2009	0.33164682980159255
2010	0.32581163594041884
2011	0.3052603367881838
2012	0.28407877223433714
2013	0.2649907077951045
2014	0.24627148194679507
2015	0.2388838533842179
2016	0.22970915861969302
2017	0.22316639425017548
2018	0.2066342082597073
2019	0.17714213851982563
2020	0.1633793267422348