Year	kg per PPP $ of GDP
1990	1.09160996978495
1991	1.043880761136395
1992	0.9741943653817532
1993	0.9439914303439595
1994	0.8822125309447417
1995	0.8816949894151727
1996	0.8035479054071254
1997	0.7632080113153628
1998	0.7658963789429547
1999	0.7048449828439239
2000	0.6771771544775105
2001	0.6560734715753769
2002	0.6423427350195283
2003	0.6663662641296593
2004	0.6813337658480076
2005	0.678263139863799
2006	0.6527461006521216
2007	0.6158692468924647
2008	0.5745056493819274
2009	0.5653536583413497
2010	0.5588125452867242
2011	0.5519905528898337
2012	0.5172971795508424
2013	0.5037333657345682
2014	0.48043970669308556
2015	0.4571288744403524
2016	0.43386333621134526
2017	0.41682049852281644
2018	0.403119951842087
2019	0.38303806785664957
2020	0.37770879385054773