Year	current US$
2000	10.497889
2001	11.35962329
2002	12.26809868
2003	18.22658278
2004	22.30841043
2005	26.50018787
2006	31.64920958
2007	38.50278188
2008	45.60781501
2009	46.4620914
2010	47.69891306
2011	44.41181922
2012	50.22166145
2013	55.41609116
2014	57.63063849
2015	51.24610169