Year	Percent
1998	9.65775
1999	10.37504
2000	10.55876
2001	10.18336
2002	10.79016
2003	11.69317
2004	11.63192
2005	11.47255
2006	12.37569
2007	11.9492
2008	12.43496
2009	15.05327
2010	14.86288
2011	15.40649
2012	15.70172
2013	15.53119
2014	15.34764