Year	current US$
1981	8462712.56488038
1982	5668632.43010337
1983	6594660.00278979
1984	8086949.98151026
1985	10610263.6203866
1986	21419522.0970484
1987	40174522.975216
1988	40670278.9627377
1989	35081469.761085
1990	37691806.7746938
1991	39836948.1754853
1992	42458761.8078568
1993	45586194.3588805
1994	43576128.703086
1995	48289716.6165226
1996	43923909.5123607
1997	37303887.2997712
1998	44669038.4601846
1999	41353799.4567597
2000	38922820.4827534
2001	37658099.7240221
2002	36521984.7950926
2003	43816496.3348545
2004	61813729.4176844
2005	67197553.9261927
2006	104661394.460191
2007	119623134.384304
2008	115230049.975587
2009	148612899.92884
2010	161382135.428761
2011	173789321.593301
2012	182228490.812076
2013	179199339.275513
2014	183998594.875318
2015	269167136.176373
2016	267345975.934803
2017	395101633.946324
2018	420592370.174891
2019	511546284.1172
2020	613636752.088083
2021	664751367.261715
2022	638537154.34393
2023	643768389.576285