Year	current US$
1987	11699999.8092651
1988	1000000
1989	16100000.381469702
1990	23399999.6185303
1991	20430000.3051758
1992	19889999.3896484
1993	15630000.1144409
1994	8520000.45776367
1995	12199999.8092651
1996	12029999.7329712
1997	11390000.3433228
1998	12390000.3433228
1999	8390000.34332275
2000	10090000.1525879
2001	8159999.847412109
2002	8640000.34332275
2003	11880000.1144409
2004	17989999.7711182
2005	23899999.6185303
2006	15029999.7329712
2007	20209999.084472697
2008	13789999.961853001
2009	21770000.4577637
2010	19700000.762939498
2011	15350000.3814697
2012	9270000.45776367
2013	1820000.05245209
2014	1919999.95708466
2015	2170000.07629395
2016	2180000.0667572
2017	1509999.9904632599
2018	2009999.9904632599
2019	1950000.04768372
2020	1730000.01907349
2021	2980000.01907349
2022	2579999.92370605