Year	constant 2015 US$
1981	1428.456355529176
1982	1510.6397802158592
1983	1560.2627002862016
1984	1612.3242842958546
1985	1661.7360894034043
1986	1771.236647419712
1987	1785.731010219212
1988	1829.6376008026634
1989	1863.7938367632914
1990	1770.5410442349612
1991	1588.2226257376383
1992	1417.7420229645757
1993	1352.368194336879
1994	1362.5090755322444
1995	1431.4609231411066
1996	1446.8783077257053
1997	1487.6455784971918
1998	1522.3897944559537
1999	1554.0519718345922
2000	1557.4384401755217
2001	1589.4037176702625
2002	1649.9388242993828
2003	1750.1904578105436
2004	1919.757153060355
2005	2041.8684940126284
2006	2197.694783034295
2007	2400.225093163563
2008	2585.824778481009
2009	2521.5945282285984
2010	2646.5616765431732
2011	3057.3172548601838
2012	3374.4383831291766
2013	3697.6013398628697
2014	3909.9133195470245
2015	3919.3512134396938
2016	3892.652204001119
2017	4023.7856231183746
2018	4242.300221575078
2019	4385.111676805218
2020	4106.602683403074
2021	4107.183720951231
2022	4249.675014062045
2023	4483.755201662131