Year	current US$
1968	62590000.0929832
1969	25089999.973773997
1970	28919999.9459088
1971	35230000.0376999
1972	42860000.295564495
1973	44610000.2527237
1974	36130000.0324845
1975	51470000.5203485
1976	43079999.7746944
1977	43079999.759793304
1978	48139999.8944253
1979	62390000.998973794
1980	65559999.97258191
1981	75530001.5304238
1982	70420000.5680323
1983	74050000.5185604
1984	56309999.987483
1985	54669999.5100498
1986	67959999.9338388
1987	49319999.873638205
1988	56249999.9403954
1989	73100000.1877546
1990	50910000.1640618
1991	38489999.679848604
1992	37169999.5622039
1993	29970000.0956655
1994	25789999.9488145
1995	18769999.8654425
1996	20360000.081360303
1997	33119999.788701497
1998	33749999.2977828
1999	990000.884979963
2000	21130000.2895296
2001	15960000.0679493
2002	16549999.7846782
2003	15280000.2284348
2004	21480000.3170967
2005	13819999.9928474
2006	14969999.9969453
2007	15030000.269413
2008	22840000.063180897
2009	24010000.1096725
2010	25389999.970793698
2011	23020000.1895428
2012	18957102.2540331
2013	24039397.418499
2014	17544756.8446398
2015	18069753.825664498
2016	12217532.858252501
2017	10224681.6977859
2018	6643166.184425349
2019	11467490.9561872
2020	13616105.705499599
2021	16760817.0807362
2022	23495365.977287292