Year	current US$
1990	3271751.72746758
1991	3714683.51764404
1992	4018782.33599189
1993	4206607.05013843
1994	4246668.88491245
1995	4891885.19205706
1996	4775190.70685088
1997	5463513.15564041
1998	6676468.45032506
1999	6922892.92789412
2000	6867796.16545742
2001	7374599.54799734
2002	8061104.89296099
2003	8615281.9055557
2004	8824974.48009792
2005	10004486.0469342
2006	10545229.3729141
2007	12104026.5913051
2008	12613737.6173977
2009	12980214.1498498
2010	14860685.6038691
2011	14317625.4714982
2012	15535024.2701341
2013	18102216.2650183
2014	13468302.9834611
2015	15995497.0088246
2016	15082852.3281559
2017	15715178.4940854
2018	15671498.4907774
2019	17127146.1912249
2020	15729005.4414938
2021	15431109.3039141