Year	current US$
1968	11300000.1311302
1969	13470000.0472367
1970	14830000.1136959
1971	20149999.8830259
1972	19459999.917075
1973	19049999.989569202
1974	17930000.156164203
1975	28609999.649226703
1976	23430000.115186002
1977	20940000.1931936
1978	20879999.9821931
1979	26519999.9287724
1980	36980000.0395626
1981	39289999.9693036
1982	35559999.9148399
1983	28399999.9016523
1984	27269999.997690298
1985	29429999.9065697
1986	33330000.264570102
1987	30829999.897629
1988	29329999.880865198
1989	28980000.043287903
1990	21650000.387802698
1991	15040000.0885129
1992	14529999.9453127
1993	8699999.93219972
1994	14860000.0161678
1995	6119999.90604818
1996	7130000.09767711
1997	3849999.96051192
1998	8510000.012815
1999	7489999.93316829
2000	4180000.11332333
2001	7780000.055208799
2002	-1679999.96244907
2003	4230000.00603497
2004	14309999.7267127
2005	4629999.99523163
2006	4129999.99150634
2007	4520000.02935529
2008	5199999.97317791
2009	4969999.96900558
2010	4679999.91774559
2011	3690000.00320375
2012	2914444.00884211
2013	2969427.98420787
2014	2315504.1988939
2015	1940751.77908235
2016	1374294.86215115
2017	1127156.09371662
2018	527805.477380753
2019	465790.01098871196
2020	706847.548484802
2021	628059.772308916
2022	856965.392827988