Year	current US$
1970	528772.586805449
1971	527041.444647705
1972	540018.07296282
1973	1035582.07920015
1974	1024776.25057091
1975	1437717.7653276
1976	1096959.3872237
1977	1248453.96881167
1978	1527881.08830879
1979	2364206.90221548
1980	2610803.46680607
1981	2153167.67386367
1982	3142909.12507402
1983	1888561.70533274
1984	1416113.85812255
1985	1197345.26353765
1986	1062813.88178228
1987	2158784.96685282
1988	2132254.49805884
1989	2400182.0958369
1990	3147308.97598246
1991	3210310.03566222
1992	3311619.51953518
1993	3276240.86513114
1994	3065982.56746469
1995	3988740.01589025
1996	3490222.89809923
1997	3443298.24737283
1998	3022844.07736749
1999	2748411.12214923
2000	2281448.46102791
2001	2381680.68447169
2002	2643521.57645875
2003	2716957.64676386
2004	2575295.32962177
2005	2724079.46136801
2006	2838685.27596952
2007	3644203.17188754
2008	4088480.18436012
2009	3948375.41794042
2010	6823086.35448978
2011	6171098.92174176
2012	6042526.46267953
2013	7383181.5174018
2014	8234144.4447445
2015	7230863.76562175
2016	8630946.20587157
2017	8135506.60231354
2018	6747383.64085985
2019	5938162.42691638
2020	7114715.62379336
2021	6007089.59267243