Year	current US$
1992	343924071.318088
1993	294413123.701557
1994	319907258.197948
1995	334841376.053327
1996	320234600.701235
1997	308836934.715676
1998	279039850.348315
1999	228353264.443569
2000	232461112.290543
2001	214317244.802669
2002	200828089.341618
2003	203978932.295563
2004	217449616.265009
2005	224821899.326315
2006	245194974.480733
2007	257031416.266613
2008	292543345.289622
2009	326193793.567311
2010	385081646.990448
2011	425784252.90165
2012	458808197.265249
2013	456856881.193553
2014	444403382.753647
2015	417015843.744962
2016	412886111.07221
2017	444572101.391441
2018	457732107.327033
2019	463239976.924245
2020	455229744.587124
2021	439784702.421538