Year	current US$
1997	6622440.18865504
1998	8559574.93631418
1999	8875503.75371042
2000	11136966.7547958
2001	23288209.098939
2002	20152761.9321029
2003	25215459.4557179
2004	46331115.3301267
2005	62818864.8311788
2006	71118987.611089
2007	71788227.9172686
2008	80513219.0386644
2009	55234953.9692445
2010	65729957.9665354
2011	70491757.2995354
2012	68005657.4680831
2013	78050228.1230467
2014	88846074.8129609
2015	108377383.698808
2016	118570363.859083
2017	122639591.3995
2018	128413647.2128
2019	136255275.213867
2020	136985187.771237
2021	148917809.63665