Year	current US$
1999	5402509618.074657
2000	4599680530.607897
2001	5279581546.704494
2002	5175366049.253344
2003	6214188970.278755
2004	7097734406.874215
2005	7021478210.938248
2006	7835547249.227035
2007	9013484884.34518
2008	10010854283.183758
2009	12042245080.785185
2010	13390264668.546494
2011	15465598309.18043
2012	18232764157.05243
2013	20948941896.27106
2014	22477514214.4015
2015	19748333505.195023
2016	20007507647.789146
2017	20947434456.071426
2018	21875375663.225708
2019	22207582617.68786
2020	21160133399.801857
2021	20923944429.47216
2022	23947424900.071285
2023	31554840618.760784