Year	current US$
1968	40390000.3004819
1969	36950000.2935529
1970	43229999.7471273
1971	49870000.384748004
1972	43389999.583363496
1973	57780000.0160933
1974	49670000.154525
1975	78070000.0189245
1976	64110000.0981241
1977	47740000.0374764
1978	56670000.4786253
1979	101790000.267327
1980	183449995.934963
1981	89599999.4203448
1982	81969999.9652803
1983	84450000.1743436
1984	73940000.4856288
1985	78089999.6235967
1986	103499999.67217399
1987	109920000.512153
1988	137139999.520034
1989	132040000.34183301
1990	68739999.8158216
1991	70650000.0059605
1992	72520000.0759214
1993	64450000.083074
1994	35759999.8675287
1995	34729999.7545779
1996	43820000.5348772
1997	39749999.4058162
1998	42879999.9132752
1999	21530000.1911819
2000	21359999.9882281
2001	14150000.078603601
2002	11170000.1228601
2003	17739999.929443
2004	22200000.0290573
2005	25610000.215470802
2006	27419999.953359403
2007	23899999.9649823
2008	28890000.000596
2009	34240000.2703071
2010	34009999.9271333
2011	26800000.211223997
2012	26394436.720758703
2013	23209722.2618759
2014	20296241.9243995
2015	20028172.4514934
2016	15577199.5407995
2017	12853995.548561199
2018	10797056.1869442
2019	13866426.6690612
2020	13561823.643744001
2021	17307177.644223
2022	18179870.98917364