Year	current US$
1971	1000000
1972	1000000
1973	1000000
1974	3000000
1975	2000000
1976	2000000
1977	2000000
1978	2000000
1979	1000000
1980	2000000
1981	5000000
1982	4000000
1983	4000000
1984	5000000
1985	3000000
1986	2000000
1987	2000000
1988	4000000
1989	3000000
1990	2000000
1991	1000000
1992	2000000
1993	71000000
1994	320000000
1995	216000000
1996	219000000
1997	144000000
1998	178900003.20971012
1999	163199998.5575676
2000	145329999.02777374
2001	210019999.6400621
2002	167100001.72629955
2003	166350001.93864107
2004	141410003.57083982
2005	156490001.99511644
2006	183580001.8403679
2007	168160003.18527216
2008	183689994.6816265
2009	210889998.28137478
2010	95990000.11384481
2011	198989998.627454
2012	200889996.14119548
2013	206620001.43528014
2014	172809995.8300594
2015	119129999.4960428
2016	47950001.00135799
2017	138700002.3722649
2018	174870004.05788416
2019	130329999.8044968
2020	235910001.12891185
2021	211439995.52726787
2022	218980003.520846