Year	kg per PPP $ of GDP
1990	1.146471055020954
1991	1.0961217167643231
1992	0.9956185536000236
1993	0.9337348063525072
1994	0.9343153281208626
1995	0.869723201940666
1996	0.87522852072075
1997	0.8886401422574676
1998	0.8677604049890594
1999	0.8603784042179722
2000	0.7897765232774955
2001	0.7655814023247133
2002	0.75012210952894
2003	0.7563528322531318
2004	0.7341157543255581
2005	0.7110694831455774
2006	0.6918419402996465
2007	0.6808176293903351
2008	0.6637717262105136
2009	0.653207481022873
2010	0.6784757989989545
2011	0.6793435081011292
2012	0.6703619567776058
2013	0.6745635260402907
2014	0.6870429907293053
2015	0.6921225464150975
2016	0.6704295736990203
2017	0.6260704124821793
2018	0.5898993466460657
2019	0.5359161072747148
2020	0.5395784771031071