Year	Percent
1995	9.87
2001	7.508
2002	7.7956
2003	6.7957
2004	9.8176
2005	13.4298
2006	13.0092
2007	11.8306
2008	10.7822
2009	10.736
2010	11.0187
2011	9.7646
2012	9.0849
2013	9.0878
2014	8.2199
2015	8.0477
2016	7.953
2017	7.4097