Year	kg per 2015 US$ of GDP
1990	1.3326563922704038
1991	1.3181362404336303
1992	1.2642425697325674
1993	1.2110049867627457
1994	1.1427102270964795
1995	1.1442442472494057
1996	1.0869526682644122
1997	1.044478831312562
1998	1.0252327522059732
1999	0.9921272882649709
2000	0.9792384021449297
2001	0.9750045113794442
2002	0.966188287362766
2003	0.9886730366095183
2004	0.9944483808567379
2005	0.9936753418483896
2006	0.9808917096259826
2007	0.957331559054307
2008	0.9313034364843311
2009	0.9198403914517433
2010	0.9149216025345991
2011	0.9186486036461086
2012	0.8958978597881774
2013	0.8735988936832068
2014	0.8430170244753672
2015	0.7973653327491226
2016	0.7659149928963277
2017	0.746478732177823
2018	0.7396785057999983
2019	0.7205910021761054
2020	0.7137609899598033