Year	current US$
1975	9465756.038210768
1976	9429999.9918
1977	11384999.9901
1978	13684999.9881
1979	14845207.20854212
1980	21699111.365036003
1981	23359721.845159903
1982	11972445.858446449
1983	12507231.488032121
1984	10386554.964262031
1985	7318487.43646122
1986	7785593.419620521
1987	11491123.86883439
1988	15714469.60618294
1989	16021197.294044299
1990	21523497.03442433
1991	21009098.62211924
1992	21384212.17650297
1993	21087279.98766251
1994	21270205.63762967
1995	20279732.501733728
1996	18569523.45617713
1997	16792292.35826756
1998	15067230.49739974
1999	19482879.402653433
2000	20476364.93321922
2001	17786990.416424163
2002	15474951.25639031
2003	23529672.53085094
2004	30942413.90873508
2005	31907529.349722017
2006	34987443.0577701
2007	38644157.109574966
2008	44670002.10982015
2009	35696170.87704928
2010	41824356.24756477
2011	41372650.946197234
2012	37037765.79864701
2013	29150651.69371842
2014	26598840.5417117
2015	42818625.30356636
2016	56680105.37833727
2017	30638938.567171007
2018	29634436.236743398
2019	26679252.971605532
2020	11110529.36200576
2021	19159288.06306846
2022	15457865.97492986
2023	13728598.021093069