Year	current US$
1970	13000000
1971	13038740.16
1972	15199939.73
1973	14305560.11
1974	14431679.73
1975	16998100.28
1976	19626840.59
1977	21015359.88
1978	16000000
1979	20000000
1980	39045898.44
1981	53062198.64
1982	35328319.55
1983	48000000
1984	72000000
1985	98000000
1986	31000000
1987	32000000
1988	14000000
1989	17000000
1990	44000000
1991	105000000
1992	79200000
1993	84900000
1994	145656797.585055
1995	149887650.510278
1996	140224314.462013
1997	112029278.906265
1998	151320537.801104
1999	246709450.020442
2000	219135624.617598
2001	204463328.500504
2002	157548258.665447
2003	64952909.2023087
2004	50532704.1705144
2005	56161403.6064596
2006	65526905.959713
2007	95056912.5186479
2008	88291702.7656574
2009	124475460.916341
2010	151325691.915413
2011	222951899.993537
2012	246242647.170108
2013	277970422.008756
2014	399081655.550903
2015	333683053.24138
2016	258624566.969654
2017	291727376.352561
2018	312663936.083913
2019	348172705.450734
2020	254084912.517049
2021	385718084.432186
2022	449510119.173536
2023	433332717.044774