Year	Percent
2001	12.18348
2002	12.62231
2003	13.86127
2004	14.90731
2005	14.36459
2006	13.52402
2007	12.27177
2008	12.37473
2009	13.48292
2010	14.69727
2011	14.72283
2012	14.18967
2013	14.72014
2014	14.93437
2015	14.87613
2016	15.05269