Year	current US$
1968	839999.973773956
1969	1580000.04291534
1970	1500000
1971	1809999.9427795399
1972	2000000
1973	1929999.94754791
1974	1820000.05245209
1975	2809999.94277954
1976	2430000.0667572
1977	2369999.8855590797
1978	2990000.00953674
1979	3960000.03814697
1980	5170000.07629395
1981	8180000.305175779
1982	8100000.38146973
1983	9829999.92370605
1984	8949999.80926514
1985	10170000.076293899
1986	9300000.19073486
1987	10319999.6948242
1988	13369999.8855591
1989	11409999.8474121
1990	10140000.3433228
1991	14239999.7711182
1992	12119999.8855591
1993	9909999.84741211
1994	6159999.84741211
1995	3740000.00953674
1996	3089999.91416931
1997	3890000.10490417
1998	4349999.90463257
1999	5400000.09536743
2000	5460000.03814697
2001	5030000.20980835
2002	3390000.10490417
2003	5699999.80926514
2004	5909999.84741211
2005	6539999.96185303
2006	7610000.1335144
2007	7340000.15258789
2008	6949999.80926514
2009	8750000
2010	9760000.22888184
2011	9000000
2012	9533944.12994385
2013	8808785.4385376
2014	9258191.10870361
2015	8164490.69976807
2016	7724186.42044067
2017	7314145.56503296
2018	9323298.45428467
2019	9591234.20715332
2020	12374489.7842407
2021	11753099.441528302
2022	9517627.71606445