Year	current US$
2000	35.09727467
2001	34.21544661
2002	34.47867237
2003	31.35774683
2004	31.62820102
2005	31.08306662
2006	33.12264422
2007	37.59480116
2008	44.08329342
2009	47.47698334
2010	47.89233796
2011	39.94942968
2012	33.89814828