Year	constant 2015 US$
1971	4600.136966234827
1972	4733.834272826431
1973	4961.505906006924
1974	4755.665661577786
1975	4919.690213731913
1976	5271.846470956855
1977	5950.410378647013
1978	5974.924657515594
1979	5875.492335086882
1980	5659.496387340817
1981	4699.663455192354
1982	4208.705395212605
1983	4537.496505056093
1984	4944.019800686343
1985	4984.263236143366
1986	5460.69768493423
1987	5218.010725544745
1988	5199.162724204735
1989	5203.156299756011
1990	5335.232607853127
1991	5341.968619732533
1992	5765.018445345666
1993	6069.025042189212
1994	6368.331809258958
1995	6460.16106663285
1996	6328.945523496839
1997	6646.662061051933
1998	6968.535653791636
1999	6803.832749946753
2000	6805.219646030396
2001	6924.116040795339
2002	6974.070779567229
2003	7130.061265397511
2004	7280.634843705629
2005	7385.625901979514
2006	7849.058295255101
2007	8361.661480132845
2008	8588.379004096907
2009	8444.59223263199
2010	8949.208043255037
2011	9156.035842884996
2012	9608.618189773017
2013	9730.834553897977
2014	9973.93677006953
2015	10446.759040717312
2016	10889.050403123532
2017	11022.466408238477
2018	11112.45629776854
2019	11314.138389937783
2020	10700.947158429233
2021	11106.126115903871