Year	current US$
1998	6920000
1999	6150000
2000	5740000
2001	13410000
2002	9640000
2003	5110000
2004	5334267.35517441
2005	18335386.5574104
2006	23417696.472641
2007	33371205.6488736
2008	41017650.5539798
2009	31363117.655086
2010	31029077.1638003
2011	34404214.8330668