Year	current US$
1990	158227960.78389
1991	162916378.305913
1992	151712180.246149
1993	143438792.948366
1994	167590803.81315
1995	161355724.771679
1996	135194882.594949
1997	148066113.109416
1998	114812821.097872
1999	102754482.495761
2000	103090473.640101
2001	110128907.383956
2002	107829412.599324
2003	122840492.451615
2004	155839572.020455
2005	206671633.315097
2006	309286432.341213
2007	329148734.329208
2008	406027358.964959
2009	323960376.901564
2010	397143916.464145
2011	431584296.615738
2012	442108227.200294
2013	465083351.42842
2014	419622020.966097
2015	301921241.086405
2016	276384555.360631
2017	296831704.877218
2018	277520523.083375
2019	233683994.591834
2020	180162425.008787