Year	current US$
1990	344.44024879538955
1991	342.1127173969503
1992	384.8237238555835
1993	297.6245595899339
1994	191.3257197134951
1995	177.1147435128845
1996	226.15331786690714
1997	272.3858356911775
1998	272.49965704033644
1999	284.52980032860376
2000	310.2235412094918
2001	341.3813232481814
2002	365.0083232599024
2003	381.2729136396885
2004	415.2311399835681
2005	462.3864756837484
2006	545.8801624673353
2007	633.7840307846047
2008	751.1344643697262
2009	799.7666795808742
2010	926.7509068629151
2011	963.0701507831805
2012	1105.7381604195543
2013	1273.4892112987354
2014	1323.2691682869759
2015	1366.411676757591
2016	1016.8872352736466
2017	849.0309330716333
2018	665.9077497638801