Year	current US$
1981	173241875.220148
1982	173755007.946308
1983	172189184.207225
1984	166975232.07726
1985	194153560.928825
1986	212720090.785272
1987	245424392.503539
1988	282539330.927498
1989	346486132.692551
1990	341776632.756833
1991	429051702.536679
1992	374728682.984384
1993	292181210.016376
1994	255276496.045604
1995	268727550.036649
1996	315442569.799044
1997	319661960.165254
1998	349724876.647725
1999	378438307.37227
2000	472421326.675604
2001	471843074.765245
2002	596171262.888956
2003	712050599.632908
2004	814744999.372159
2005	979287510.837772
2006	1382570631.66213
2007	1710445927.77574
2008	2414419238.95361
2009	3098711192.03656
2010	2820476914.85806
2011	3111213780.72281
2012	4805975267.02762
2013	5455663512.67621
2014	5440199647.1036
2015	6809054816.64633
2016	7342284590.22459
2017	7869945651.05174
2018	7799318653.31906
2019	8021792181.91723
2020	8459099161.93174
2021	8179708473.38764