Year	constant 2021 US$
1999	19749345
2000	16051632.999999998
2001	22546296
2002	16409848
2003	28519057
2004	44241018
2005	83763504
2006	75411607
2007	75721966
2008	88322958
2009	73224725
2010	74863048
2011	81850486
2012	80995626
2013	84243571
2014	81684214
2015	99914831
2016	125775293
2017	137068130
2018	148264327
2019	128183778.99999999
2020	150018918
2021	155280000
2022	180085755