Year	current US$
1976	20990030.29
1977	23312740.33
1978	28834312.44
1979	22142263.41
1980	22224737.17
1981	22276037.22
1982	16929426.19
1983	16205863.949999997
1984	15447328.57
1985	16776596.07
1986	8815796.852
1987	9654110.909
1988	5828836.441
1989	9480462.074
1990	5692599.62049336
1991	5407622.04326999
1992	7914672.29487808
1993	6973905.96850117
1994	10874355.8797724
1995	21147237.642083
1996	11300499.1053772
1997	19893149.6733455
1998	7903576.36830666
1999	7587093.51092752
2000	21157330.2853808
2001	20921483.6181655
2002	12941948.7948983
2003	17152281.4733371
2004	12926881.4902044
2005	15646275.9807826
2006	16453485.0960726
2007	15218225.4508562
2008	15744942.7487369
2009	12886263.9092037
2010	13343579.7121699
2011	19037020.374821
2012	18439178.9870189
2013	19573346.1907376
2014	28450675.1881249
2015	26457656.27987
2016	27420431.0920067
2017	29263151.3686103
2018	28615813.6613976
2019	29819021.5782786
2020	24284517.9656391
2021	31505959.3398352
2022	41543837.325642