Year	kg per PPP $ of GDP
1990	0.7195002063077749
1991	0.6890205517785984
1992	0.6575451128090152
1993	0.6348204153829129
1994	0.6065441822725243
1995	0.5909847788893469
1996	0.5699085924230342
1997	0.5488494101068135
1998	0.5346883250054332
1999	0.5132049256829926
2000	0.4927230905992759
2001	0.4770114951827904
2002	0.4615372051637965
2003	0.4568519853661344
2004	0.44199752109402496
2005	0.42591548874897367
2006	0.4017459795093716
2007	0.3851019639079269
2008	0.3662135563336175
2009	0.3586391487739067
2010	0.35714177753035525
2011	0.34532160425061836
2012	0.3317593662022166
2013	0.3222160975076364
2014	0.31142731081422154
2015	0.302799103780598
2016	0.2912687179738541
2017	0.2804021758556315
2018	0.26995986465833083
2019	0.2544157063818286
2020	0.24148417731819918