Year	Percent
2000	6.5312
2001	8.0609
2002	8.2951
2003	9.8815
2004	8.2508
2005	8.3632
2006	8.3155
2007	7.8955
2008	6.777
2009	7.629
2010	7.1316
2011	7.1266
2012	7.3145
2013	6.2533
2014	5.3298
2015	5.1999
2016	5.2061
2017	4.6582