Year	constant 2015 US$
1990	3575.128371086899
1991	3390.908772580702
1992	3355.283249981666
1993	3050.917990954504
1994	2366.384297232507
1995	1921.4291506231361
1996	1850.646784802014
1997	1940.190686191073
1998	1960.4206409841995
1999	1988.7334138057622
2000	2020.1667298455643
2001	2186.5447086899762
2002	2243.2821954586198
2003	2499.2351218325866
2004	2825.7663710170223
2005	3100.0950370919436
2006	3452.729649275847
2007	3782.6429505276537
2008	3986.4499948166485
2009	3926.254768046886
2010	4314.8923553442
2011	4761.068233261949
2012	5167.456616425635
2013	5635.536706181271
2014	5626.898361659365
2015	5646.156067376836
2016	5635.125175400852
2017	5644.702523849947
2018	5909.5705887263
2019	6188.638440245489
2020	5883.0998192804345
2021	6109.652657094389
2022	6091.797228189664