Year	current US$
2000	19.38640241
2001	24.27204673
2002	28.89161743
2003	29.04908708
2004	28.99624196
2005	31.6173964
2006	30.2307005
2007	34.27390772
2008	38.37626312
2009	39.44803517
2010	39.72728856
2011	33.83530894
2012	28.59260808