Year	current US$
1997	1128413123.95345
1998	854700763.8643
1999	851825964.70008
2000	301839552.272824
2001	569232555.979268
2002	748561069.676219
2003	981039288.380386
2004	1138141568.22995
2005	1187466513.67483
2006	1384040179.57936
2007	1836385812.82558
2008	2360383259.30712
2009	2091478510.10497
2010	1874613516.98017
2011	2121962146.57987
2012	1757798062.51116
2013	1907238561.21857
2014	1813556890.74397
2015	1473449179.80086
2016	1432067417.82126
2017	1555448367.11269
2018	1756105226.82695
2019	1802794879.62676
2020	1913921302.52903
2021	2243744586.47587