Year	constant 2015 US$
1980	3717.8079692935034
1981	2900.139821671407
1982	2758.399357135258
1983	2678.7238565371895
1984	2639.7261802020635
1985	2325.509543034839
1986	2493.508692931437
1987	2921.448773380125
1988	3241.779531654057
1989	3477.2499334669255
1990	4878.619847314487
1991	5131.156253589924
1992	5315.27199148406
1993	5491.0504377374245
1994	5479.103960287713
1995	5471.033569952715
1996	5311.740990479398
1997	4881.15634387748
1998	4894.512848105899
1999	5024.506053298664
2000	4901.443917293299
2001	4923.38353596636
2002	4976.211376016012
2003	4883.6668298857785
2004	4780.921746065657
2005	4739.12506448774
2006	4679.196286099532
2007	4575.521900895194
2008	4225.105435070412
2009	4325.009576494239
2010	4065.3024995733676
2011	4131.18185917344
2012	4264.123670037334
2013	4418.675679534531
2014	4544.539167974354
2015	4912.612729333511
2016	4849.883310997992
2017	4699.276892347271
2018	4540.35475817753
2019	4671.224931585662
2020	4088.519220269973
2021	4561.736762688948