Year	current US$
2000	35.09727467
2001	34.21544913
2002	34.47866991
2003	31.35774683
2004	31.62820102
2005	31.08367683
2006	33.12264585
2007	37.59480103
2008	44.08335792
2009	47.47913994
2010	47.89554822
2011	39.96280027
2012	33.89814673