Year	current US$
1998	1362371371.8920662
1999	1451087194.8686237
2000	1563575665.5848224
2001	1619108694.0907686
2002	1648503768.8768346
2003	1852942271.1598096
2004	1994290156.6189833
2005	2227725279.1001563
2006	2754114064.4816656
2007	3389459543.1609015
2008	4194541262.7644873
2009	3840600775.9204273
2010	3898209144.723697
2011	4305329162.963539
2012	4767387381.825706
2013	5217293065.975588
2014	4734665359.040817
2015	5435510885.29805
2016	4769583067.346121
2017	5398646390.002114
2018	6148427536.202491
2019	6210425438.229576