Year	current US$
1999	5547488447.95768
2000	5000476947.66575
2001	4716023854.31142
2002	4703043208.39718
2003	4990019137.93133
2004	9204899942.09712
2005	11126416784.1933
2006	9540688701.22648
2007	15847328611.4985
2008	13525081078.3186
2009	1429318321.54332
2010	5258339767.14778
2011	5939855717.9397
2012	10031436973.5281
2013	9068763836.3736
2014	10824647779.0917
2015	5506469419.08523
2016	6663563134.43784
2017	8357585661.50093
2018	7988923383.00166
2019	5134499039.16083
2020	7790059614.46461
2021	12176187812.9856