Year	current US$
1970	18930000.122636564
1971	19810000.21845103
1972	18849999.761208892
1973	19110000.202432275
1974	22320000.275969498
1975	34259999.15599822
1976	34430000.15616414
1977	46530000.15020373
1978	61940000.83208091
1979	77239999.29428095
1980	80280001.28269187
1981	90020000.51736832
1982	97520000.21934508
1983	85350000.50067903
1984	93309998.27384958
1985	97689999.99761583
1986	110250000.47683711
1987	108579999.56607819
1988	108920000.73194505
1989	118039999.127388
1990	115159999.13215634
1991	117060000.89645396
1992	113350002.52723697
1993	109320003.62873076
1994	91639998.19755562
1995	63370000.83923338
1996	60529999.792575784
1997	70969999.37295909
1998	69569999.99284738
1999	66910000.532865494
2000	66159999.132156394
2001	53140001.05857853
2002	60710001.20043763
2003	53939999.93801125
2004	65039999.78303909
2005	62150000.45299539
2006	60400000.39339066
2007	70739999.65190881
2008	58519999.8021126
2009	82799998.87943274
2010	77180001.55687335
2011	70130000.11444078
2012	65007560.84918979
2013	54953528.76186372
2014	52971589.684486344
2015	48261535.346507974
2016	34790029.19793129
2017	31365252.733230595
2018	21343017.518520355
2019	27230090.826749813
2020	25901385.575532913
2021	31720873.475074764
2022	37892741.620540634