Year	current US$
1971	1309999.9912083147
1972	3669999.929144977
1973	5530000.023543831
1974	9570000.095292928
1975	16300000.488758111
1976	20769999.96416272
1977	19289999.88734722
1978	19510000.10967255
1979	25509999.59930775
1980	33269999.718293574
1981	36270000.32551583
1982	39999999.990686774
1983	47500000.45076019
1984	55259999.65891233
1985	52420001.370832324
1986	82210001.26935534
1987	112939999.16315074
1988	181590001.30929047
1989	165790000.2691895
1990	175999999.79883417
1991	177769999.6046723
1992	135529999.95462584
1993	61139999.5889515
1994	65880000.46834361
1995	52490000.32804908
1996	54519999.26567078
1997	45590000.24944544
1998	52929999.262094446
1999	55789999.61726368
2000	53530000.412836656
2001	62450000.09611255
2002	69760000.30338754
2003	87339999.66830012
2004	118210000.76830384
2005	269569999.17887187
2006	143620000.15936777
2007	187690000.2229959
2008	204590002.51442185
2009	227300003.20821995
2010	237309997.32017508
2011	224939999.48352566
2012	217430003.60392046
2013	250700001.84886158
2014	295939998.0921299
2015	181690001.3014675
2016	153620000.76659033
2017	124489999.06517565
2018	102269999.94181092
2019	126399999.40246344
2020	139320000.06735325
2021	142930000.135675
2022	118709998.81438914