Year	current US$
1968	1299999.95231628
1969	4650000.09536743
1970	5019999.98092651
1971	5590000.15258789
1972	5360000.01430511
1973	4829999.9833107
1974	4660000.08583069
1975	5409999.9666214
1976	5050000.07152557
1977	5669999.95708466
1978	7630000.11444092
1979	8669999.95708466
1980	7879999.87602234
1981	8089999.79496002
1982	5349999.78542328
1983	3870000.0047683697
1984	3409999.9666214
1985	3200000.04768372
1986	3709999.97854233
1987	4079999.92370605
1988	8009999.871253971
1989	8439999.81880188
1990	6699999.92847443
1991	5030000.03099442
1992	4080000.00193715
1993	4800000.052899119
1994	6290000.0475347
1995	10539999.950677201
1996	20140000.0154972
1997	28450000.1333654
1998	31520000.2267957
1999	33200000.315904602
2000	19300000.1423061
2001	18719999.9243021
2002	18020000.0777841
2003	21600000.0238419
2004	25479999.9669194
2005	28670000.1358986
2006	33469999.9094009
2007	32400000.274181403
2008	36229999.7806549
2009	37350000.4410744
2010	35399999.7377396
2011	25279999.554157298
2012	23362627.2827387
2013	24282350.1378298
2014	20073721.125721898
2015	18378853.574395202
2016	13946158.7965488
2017	12513175.200671
2018	8126188.635826111
2019	8820023.71549606
2020	9856173.47061634
2021	12843206.7036629
2022	17630248.87442588