Year	current US$
1970	30230000.007897634
1971	36879999.84435737
1972	39699999.82975421
1973	40449999.92474913
1974	38120000.30651688
1975	56570000.07666647
1976	47589999.8471141
1977	37690000.070258975
1978	58850000.634789474
1979	64109999.91931024
1980	95189999.083057
1981	97289999.75323674
1982	89279999.74228437
1983	85780000.06824735
1984	73540000.40888788
1985	78410000.65207478
1986	91650000.13820836
1987	101589999.00147314
1988	131169999.93659553
1989	137229998.9890308
1990	134160000.80853704
1991	119429998.62693246
1992	103059999.18468295
1993	80809999.72857527
1994	76000000.62026082
1995	67690000.81159179
1996	71160001.14567578
1997	88440000.17642972
1998	73550000.08642672
1999	68820000.47340986
2000	53899999.499320984
2001	43480000.30592083
2002	27809999.652206905
2003	36060000.56117774
2004	55129999.77171422
2005	50060000.434517875
2006	54599999.69974161
2007	52939999.5803833
2008	54279999.72365795
2009	53240000.05424023
2010	55379999.9207258
2011	45339999.776333585
2012	41802485.50139366
2013	39347749.59459901
2014	35508877.728134386
2015	30404878.91901283
2016	25460085.846483696
2017	21510846.503078934
2018	13519442.1261549
2019	14331071.011722088
2020	17178486.09387875
2021	20389504.30974365
2022	21094721.555709835