Year	current US$
1990	3865822.83951752
1991	3851285.39682496
1992	4048284.52842736
1993	4124166.09565258
1994	4194960.32036688
1995	4697583.67328534
1996	5039888.02651589
1997	5111403.08686931
1998	5282172.40235588
1999	5240872.05639038
2000	5373585.98130972
2001	5294874.93519901
2002	5304263.22997322
2003	5120028.06904966
2004	5277033.12337394
2005	5456595.59367159
2006	5648804.65522518
2007	5799025.10129298
2008	5742634.71291233
2009	5501257.49796121
2010	5546559.35083367
2011	5762017.89281432
2012	5679057.13555046
2013	5842366.4548187
2014	5958268.83224745
2015	6226072.17005703
2016	6456989.66878639
2017	6559086.56660243
2018	6593561.97479126
2019	6729691.29668071
2020	6626164.48898415
2021	7026137.19980035