Year	Percent
2001	28.711
2002	20.67674
2003	21.53574
2004	21.02538
2005	20.54585
2006	16.74933
2007	18.86551
2008	17.34874
2009	17.21854
2010	15.65671
2011	18.45205
2012	19.54745