Year	current US$
1970	32910000.011324897
1971	39599999.94188547
1972	41429999.604821205
1973	45479999.81045722
1974	45330000.139772855
1975	71150000.15497205
1976	60320000.089704975
1977	44350000.06854535
1978	53440000.5079806
1979	76319999.62031843
1980	85789999.26149847
1981	84249999.34434888
1982	76059999.91297723
1983	64590000.42080877
1984	60220000.17762182
1985	63710000.03814699
1986	87760000.0575185
1987	94030000.47802927
1988	118739999.20487408
1989	115080000.53465365
1990	58549999.885261066
1991	60310000.03218651
1992	59549999.91506338
1993	56030000.01609326
1994	29529999.87453223
1995	29719999.805092797
1996	40860000.489279576
1997	37309999.43800267
1998	39519999.91945922
1999	19590000.228956345
2000	16819999.94814397
2001	12990000.082179904
2002	9390000.142157072
2003	16729999.91290271
2004	21030000.012367964
2005	24360000.215470795
2006	26099999.96051193
2007	22509999.93085861
2008	27849999.994039536
2009	32680000.264197588
2010	33029999.94158743
2011	23910000.106319793
2012	23356619.1829741
2013	22546879.284083832
2014	19834455.69686592
2015	17336709.13004607
2016	13421906.601637602
2017	10246851.038187744
2018	9124072.927981617
2019	12083967.242389921
2020	12032169.632613657
2021	15511376.578360794
2022	17424232.449382532