Year	Percent
2000	9.4763
2001	11.7087
2002	13.5113
2003	13.4328
2004	9.7695
2005	10.9864
2006	9.3936
2007	9.0382
2008	8.2254
2009	7.4625
2010	8.6331
2011	7.1574
2012	8.4081
2013	9.0909
2014	8.1278
2015	10.1207
2016	11.3627
2017	10.5114