Year	current US$
1968	291.666239062017
1969	319.64748533855544
1970	351.6213977983642
1971	384.20302352267106
1972	467.41450386560786
1973	556.3514027602241
1974	812.5029397832162
1975	1106.5380465723208
1976	1508.4347427941927
1977	1622.4341519158943
1978	1773.3980890717157
1979	2232.188599965879
1980	2733.6481292226467
1981	2957.619866811512
1982	2747.319733194604
1983	2417.1684524293364
1984	2341.043453846016
1985	2271.546900557425
1986	2305.9724185322
1987	2317.0872207562043
1988	2354.9493362139538
1989	2326.283111716023
1990	2611.4852400527443
1991	2094.9772069442683
1992	2119.5382375169465
1993	2040.3386780276098
1994	2037.9021273282021
1995	2075.365391153784
1996	2149.063657708875
1997	2242.4821571477305
1998	2230.625488482839
1999	2218.387759507385
2000	2416.2202118877008
2001	2513.74771131564
2002	2461.6399308725468
2003	2623.756660608202
2004	3054.1154580098155
2005	3499.2839971658723
2006	4041.9948794763
2007	4628.79021651495
2008	5405.065068595876
2009	5461.21700338923
2010	5738.476885097264
2011	6047.039358379308
2012	6893.111847065425
2013	7323.814407455682
2014	7366.740082315677
2015	6916.0122934380315
2016	6469.111948802778
2017	6034.236141649202
2018	6278.772903980968
2019	6503.653442026796
2020	5993.083837671488
2021	6404.608604624537
2022	7122.328931318442
2023	7329.818921048649