Year	current US$
1970	14668282.4099053
1971	13203995.3481009
1972	15499573.1298424
1973	25287259.2916777
1974	29264552.990626
1975	38174118.0567205
1976	34844231.6676349
1977	58221011.1821069
1978	61597603.0125257
1979	59673656.3857951
1980	73182148.9068325
1981	64378657.593095
1982	87849359.567996
1983	61705966.1832384
1984	58380543.7715806
1985	45604799.5531115
1986	69805476.3313867
1987	69776328.1243138
1988	77208998.3806408
1989	79348816.6010381
1990	101776858.063996
1991	101182025.815712
1992	104173871.098602
1993	91734763.4570946
1994	107939553.250413
1995	156258431.798412
1996	156280995.402006
1997	146526997.31146
1998	152646009.445919
1999	103065695.184567
2000	102991574.857247
2001	100179836.256496
2002	120800295.573224
2003	189951235.8171
2004	164658121.800363
2005	174398444.012091
2006	177249383.357176
2007	253711539.149756
2008	309077599.585763
2009	311102612.059144
2010	279006797.836754
2011	326728940.697863
2012	377814800.456123
2013	406295498.845941
2014	476651224.341751
2015	488477180.43747
2016	514491658.388949
2017	525231054.298401
2018	403241732.043398
2019	374639176.693989
2020	403837997.756857
2021	427706387.516641