Year	current US$
1970	477.4098689896376
1971	523.6963583466825
1972	564.6839710802552
1973	640.5708240321286
1974	778.3069121183754
1975	950.7653880206498
1976	859.295794495588
1977	773.4827032047051
1978	618.6619595118544
1979	718.1310662335276
1980	789.4378251167565
1981	994.2785669493625
1982	992.1534347610684
1983	730.3931056965016
1984	717.2854015765819
1985	666.9137268429062
1986	621.7069548510902
1987	833.9066075787321
1988	538.2333325410443
1989	797.8221403282167
1990	961.1849805222682
1991	1332.1252158049817
1992	1378.3018281430955
1993	1310.4947025607723
1994	1642.5948146633164
1995	1894.5735939699427
1996	1956.676862738946
1997	2034.3581126005654
1998	1926.1548288482757
1999	1689.2242938263742
2000	1696.0413633626056
2001	1712.36569031145
2002	1783.5505128283107
2003	1871.7582302369362
2004	2029.5063073070069
2005	2254.7909780005957
2006	2450.880566501075
2007	2834.8643081136665
2008	3422.265013501642
2009	3474.027351853504
2010	4146.108961106581
2011	4732.8048766068105
2012	5373.173893031564
2013	5668.553125198772
2014	5662.322844404605
2015	5349.6204392119425
2016	5217.968702488332
2017	5556.126981946077
2018	5704.080291150208
2019	5964.372766514868
2020	5207.104702036971
2021	5056.798183014172