Year	current US$
1977	4266666.666666666
1978	5933333.333333333
1979	7355555.555555555
1980	9677777.777777778
1981	10696296.296296295
1982	7533333.333333333
1983	8077777.777777777
1984	9870370.37037037
1985	10970370.37037037
1986	15299999.999999998
1987	17940740.74074074
1988	19770370.37037037
1989	24144444.444444444
1990	25751851.85185185
1991	17574074.074074075
1992	19877777.777777776
1993	23566666.666666664
1994	25722222.22222222
1995	35081481.48148148
1996	38951851.85185185
1997	44058873.68850332
1998	45738330.92351611
1999	47799651.50335521
2000	43988432.87732177
2001	47028509.99147296
2002	51948244.54083714
2003	57854150.44674304
2004	65374074.07407407
2005	73174074.07407407
2006	92570370.37037036
2007	88270370.37037036
2008	99140740.74074073
2009	83803703.7037037
2010	85644444.44444443
2011	112500000
2012	110718518.51851851
2013	117103703.7037037
2014	133648148.14814813
2015	129618518.51851851
2016	129151851.85185185
2017	124277777.77777778
2018	130670370.37037036
2019	132622222.22222221
2020	110777777.77777778
2021	105496296.29629628
2022	127518518.51851851
2023	160573851.85185185