Year	current US$
1990	2302343.80821793
1991	2561850.70182348
1992	4018782.33599189
1993	4066386.81513381
1994	4539542.60111331
1995	5197628.01656062
1996	5411882.80109766
1997	5794635.16507316
1998	6676468.45032506
1999	6922892.92789412
2000	7239028.39061728
2001	8150873.18462864
2002	8665687.77494804
2003	9455797.04540114
2004	9928095.87916528
2005	10237148.2873877
2006	11771418.3759651
2007	12361558.8270223
2008	13150492.6989265
2009	37835943.6006228
2010	15146467.7572672
2011	17598747.5864653
2012	23302536.4052012
2013	16485946.5771742
2014	17172085.7269195
2015	17386409.4768018
2016	18314892.3420995
2017	19831058.1245131
2018	20764734.0699485
2019	22020618.0941119
2020	16830635.5558481
2021	19688416.459253