Year	current US$
1975	5719583.035
1976	17449199.68
1977	12807251.93
1978	22770250.32
1979	18460775.38
1980	13476748.47
1981	13484390.26
1982	10895115.85
1983	11418684.01
1984	6799004.555
1985	5537935.257
1986	6656090.26
1987	9116051.674
1988	7663223.743
1989	2916519.403
1990	6371437.3409868
1991	3439016.23293215
1992	6983926.62221097
1994	7136412.07070579
1995	8749785.30619388
1996	8754288.14214162
1997	45864899.236232
1998	70600678.8510884
1999	26039933.4245432
2001	5091442.62781064
2002	5714347.99765542
2003	6584529.53810806
2004	34022964.8200533
2005	56408976.7048306
2006	25399012.3629819
2007	16364507.5896175
2008	64495401.1322619
2009	60803848.0228032
2010	19103878.4579001
2011	25857336.9057456
2012	14509118.397607
2013	16198367.0059141
2014	170953253.978789
2015	35050867.9185945
2016	17907896.664736
2017	20214354.7882318
2018	10730012.9361666
2019	2563928.55203916
2020	8394378.96715598
2021	8973960.1604371
2022	11426138.3552769