Year	current US$
1970	2032110.14617125
1971	2027114.94770949
1972	2263605.62012546
1973	2306744.59569492
1974	2549386.30136513
1975	2876181.73389304
1976	2710285.77540658
1977	2818002.07490365
1978	2994835.60607349
1979	3972489.46650387
1980	4190375.05001432
1981	5510852.72727271
1982	5219945.7907688
1983	5133839.57041696
1984	4280505.32771019
1985	4848811.4859765
1986	3863970.12336736
1987	4854110.59870391
1988	4446575.70337345
1989	5674406.87365028
1990	6467136.26525221
1991	6527852.13033243
1992	5670852.55385598
1993	5785866.40637189
1994	5665957.73217445
1995	5908377.06976761
1996	6171064.76517487
1997	6084953.20840274
1998	4507954.48620401
1999	4812358.12235229
2000	7916691.34573635
2001	8003533.63653754
2002	8351545.59287879
2003	9137735.55616745
2004	9790154.94288808
2005	10324041.3767605
2006	10039171.5131077
2007	11289713.0913301
2008	13206611.7910721
2009	11992634.3966283
2010	11678098.7595451
2011	14381408.4432294
2012	13726259.1915524
2013	11902214.3566021
2014	12670688.0326022
2015	12456213.3765621
2016	14021406.2691274
2017	15694018.4888593
2018	16860600.9763316
2019	17052214.4148173
2020	16892558.1928677
2021	19033605.0364994