Year	kg per 2015 US$ of GDP
1990	0.40061381865797635
1991	0.42219752288620405
1992	3.892456402073011
1993	3.7878633749789716
1994	3.499884045699175
1995	3.1675514639315283
1996	2.085202758191827
1997	1.149479764564224
1998	1.1289629510901416
1999	1.4479273129747983
2000	0.7341990904930469
2001	0.6557439350266053
2002	0.4826639127626012
2003	0.4654865881032066
2004	0.6658154691584138
2005	0.5798380781505635
2006	0.5359109095178216
2007	0.5266196570901163
2008	0.4110020679969016
2009	0.42298641975699386
2010	0.4630321746925389
2011	0.4376427124506557
2012	0.38944240026062005
2013	0.4146150937353716
2014	0.40990964101062405
2015	0.4166850934461004
2016	0.484911910234457
2017	0.47341630580708943
2018	0.47661903911168
2019	0.48515983395060974
2020	0.4545986748840231