Year	current US$
1968	2519999.98092651
1969	1919999.95708466
1970	2210000.03814697
1971	2430000.0667572
1972	2630000.1144409203
1973	2980000.01907349
1974	3079999.92370605
1975	5400000.09536743
1976	5070000.17166138
1977	4070000.1716613797
1978	5719999.79019165
1979	7550000.19073486
1980	10079999.923706101
1981	13390000.3433228
1982	13260000.2288818
1983	9430000.30517578
1984	9909999.84741211
1985	7679999.82833862
1986	6280000.20980835
1987	8600000.38146973
1988	10579999.923706101
1989	16000000
1990	15720000.2670288
1991	17309999.4659424
1992	18559999.4659424
1993	17819999.6948242
1994	4610000.1335144
1995	16409999.847412098
1996	9590000.15258789
1997	13409999.8474121
1998	13270000.4577637
1999	9930000.30517578
2000	8739999.77111816
2001	5239999.771118159
2002	5550000.19073486
2003	6809999.94277954
2004	7170000.07629395
2005	7809999.94277954
2006	8619999.88555908
2007	9460000.03814697
2008	10819999.6948242
2009	10569999.6948242
2010	10229999.5422363
2011	6539999.96185303
2012	7939013.00430298
2013	11351735.1150513
2014	8338186.26403809
2015	7704967.498779301
2016	7258401.87072754
2017	6530575.27542114
2018	6170131.20651245
2019	7464569.091796881
2020	6958512.78305054
2021	6713455.20019531
2022	6967606.54449463