Year	current US$
1970	14939999.818801869
1971	15579999.942332495
1972	22670000.5531311
1973	21130000.114440892
1974	27220000.26702881
1975	20369999.40872192
1976	41630000.35285953
1977	21670000.07629395
1978	26370000.72002411
1979	23699999.35105446
1980	43719999.04885888
1981	22589999.709278345
1982	60609998.28390774
1983	38720000.65445901
1984	30990000.398829572
1985	19409999.767318364
1986	15330000.180751078
1987	43090001.01685522
1988	96700001.71661378
1989	78099999.75562108
1990	84520001.55299905
1991	97709999.96364115
1992	59099998.146295525
1993	51850000.64969055
1994	50580001.05619428
1995	84479998.46190216
1996	133949999.15175153
1997	33989999.03351063
1998	25879999.622702558
1999	27269999.86171718
2000	22910000.003874324
2001	16470000.01370906
2002	19589999.8769164
2003	75020000.70549555
2004	101269998.04377553
2005	423879998.50511557
2006	62539999.559521645
2007	91660000.551492
2008	209599998.8019466
2009	74489999.383688
2010	30220000.877976414
2011	45820000.26106829
2012	66889999.9260902
2013	228129998.38590622
2014	235499999.12083152
2015	339180000.7224084
2016	228619998.44759703
2017	388070007.0559975
2018	394220003.4260746
2019	340070004.8804283
2020	333039994.31431293
2021	374700006.72340393
2022	308320006.97962934