Year	current US$
1998	553438715.060422
1999	578009989.936255
2000	629003991.476564
2001	687087174.273227
2002	718764569.97024
2003	804331780.680983
2004	932154582.682694
2005	1047866808.49511
2006	1396055102.03792
2007	1609524738.61964
2008	1850837988.52746
2009	1872885184.8085
2010	2545308578.53627
2011	3100895170.13845
2012	3469136250.95874
2013	3825409332.54769
2014	3964951019.59386
2015	3756738807.34867
2016	3813366120.25355
2017	4575906814.96345