Year	current US$
1977	103385622.685268
1978	129521978.4280913
1979	159910000.371039
1980	250400000.5008
1981	337520083.99170566
1982	392244337.7943312
1983	227538461.53846127
1984	230230769.2307688
1985	315051460.8908055
1986	178800000
1987	143537777.7777773
1988	112466666.66666658
1989	162822222.222222
1990	134100000
1991	37100000
1992	135000000
1993	38500000
1994	44000000
1995	81800000
1996	37000000
1997	29700000
1998	13600000
1999	81500000
2000	24200000
2001	13500000
2002	130430000
2003	31040000
2004	34880000
2005	133794158.6874162
2006	246480449.67941582
2007	467716150.8792004
2008	381587678.9062471
2009	283334089.5689822
2010	212274601.0353703
2011	300212160.02076495
2012	860612710.060906
2013	1019062930.1172309
2014	1524861877.065373
2015	1599278800.104609
2016	1491986476.1086998
2017	1753736045.2424762
2018	1485806288.327168
2019	1351788909.3019276
2020	1257205172.6753454
2021	1592788943.4743962
2022	1521600982.829958