Year	constant 2021 US$
1998	432023
1999	1044044
2000	1632668
2001	1483068
2002	3430173
2003	2383020
2004	9250839
2005	17136607
2006	23017791
2007	21526457
2008	25877706
2009	22967180
2010	24021263
2011	27941412
2012	27894322
2013	34237389
2014	40648682
2015	43644077
2016	54834833
2017	51339726
2018	53084384
2019	53840460
2020	54794869
2021	60230000
2022	196207032