Year	current US$
1991	5794762.31013081
1992	6009896.40522319
1993	5926359.71882731
1994	5973760.81154519
1995	6103346.45295336
1996	6098618.96202759
1997	9999301.59978972
1998	11090504.8255898
1999	10905951.1170103
2000	10430563.165184
2001	10492086.5971133
2002	10726791.1738169
2003	11402933.5404541
2004	11559025.0141959
2005	12126590.9713549
2006	12535426.4402973
2007	12807049.5940819
2008	12804080.755627
2009	12731147.2714788
2010	12786758.0492098
2011	12719269.4084256
2012	13181924.1230693
2013	13835720.1967511
2014	14668879.4639278
2015	15548417.6520766
2016	15306078.9274015
2017	15031918.2554313
2018	15223693.1242932
2019	15428579.7393455
2020	14518855.9275168
2021	14482894.7545231