Year	Percent
1995	9.68
1996	12.13
1997	9.87
1998	7.98
1999	7.89
2000	9.56
2001	9.16
2002	10.26
2003	11.49
2004	11.2
2005	10.27
2006	11.38
2007	12.31
2008	10.24
2009	8.02
2010	7.26
2011	8.45
2012	8.81
2013	7.48
2014	6.99
2015	6.81
2016	5.44
2017	4.53