Year	current US$
1971	405.1062821343191
1972	451.26445647211
1973	524.9414654070863
1974	643.2804086894009
1975	714.48777279101
1976	852.1968427592653
1977	1019.2884959440925
1978	1226.8911253697252
1979	1493.1236409006874
1980	1705.4825120225603
1981	1848.8254108504914
1982	1873.9068571826906
1983	1870.5304204256427
1984	1758.8311359484685
1985	1652.7779418106322
1986	2025.7478901233767
1987	2010.280552977589
1988	1742.6917310007707
1989	1117.9197985054004
1990	1048.2250398242163
1991	984.1303134576758
1992	1188.2927703930216
1993	1205.780285346577
1994	1283.3841166349341
1995	1340.3387767172724
1996	1325.7926227728592
1997	1361.4838135853868
1998	1467.6444917831361
1999	1471.658396512039
2000	1558.7185030604187
2001	1630.1705787368278
2002	1687.963498401054
2003	1777.7709331078977
2004	1965.8564236815043
2005	2108.6238071174707
2006	2381.843808591982
2007	2542.548219430422
2008	3205.237798254346
2009	3380.2904438570763
2010	3588.6299267383492
2011	3791.6663862845603
2012	4011.2159598759713
2013	4127.937926176734
2014	3917.0959734295093
2015	3736.502281107789
2016	3668.050476998303
2017	3810.797618960565
2018	3893.3638348985864
2019	3973.991539480878
2020	3833.6140115204057
2021	3905.9067528064784