Year	current US$
1971	18177015.3
1972	17820796.97
1973	19522953.03
1974	18677930.83
1975	21830467.22
1976	32224994.66
1977	36229381.56
1978	26467153.55
1979	28733226.78
1980	35029144.29
1981	28187164.31
1982	39306793.21
1983	42779594.42
1984	36873622.89
1985	34743316.65
1986	45802402.5
1987	46021369.93
1988	51684013.37
1989	70015853.88
1990	58211399.08
1991	42017990.11
1992	30490085.6
1993	25454542.16
1994	23547245.03
1995	15190289.2349044
1996	13121567.3102585
1997	9111576.98391652
1998	13097150.3833185
1999	20135248.6017701
2000	17497061.3431313
2001	12930129.4156126
2002	21201644.6945299
2003	25794804.037383
2004	319219551.908666
2005	222082588.835843
2006	208795974.103382
2007	229286698.436007
2008	264462405.60039
2009	259902916.946395
2010	229566340.672971
2011	227124909.986339
2012	200108441.489539
2013	245878450.107811
2014	252779864.011929
2015	274400266.635686
2016	251428716.529282
2017	269545190.671375
2018	277412663.325204
2019	245293469.265106
2020	259358516.769493
2021	269481041.291715
2022	225994472.308482
2023	233085510.798959