Year	current US$
1990	10197168.3320814
1991	21978907.0805979
1992	22449108.8514572
1993	22775271.6728515
1994	21976116.3170565
1995	23647640.7430177
1996	23288993.7083022
1997	20686106.6466322
1998	21013043.4598699
1999	19577360.6638227
2000	17173144.7979705
2001	14221279.782746
2002	12345576.8483638
2003	9951603.04349523
2004	20022395.1285318
2005	21988376.7188788
2006	21823950.1021525
2007	25382099.1331979
2008	27919884.2500756
2009	23770004.1716188
2010	23371053.3400045
2011	21461708.1709726
2012	20271314.7092622
2013	18972422.6682299
2014	17430036.19301
2015	17369245.3672282
2016	18234313.7857724
2017	17651237.8812599
2018	17541345.6572005
2019	17723374.6023977
2020	17455230.3215473
2021	18724781.4909018