Year	Percent
1994	9.04
1995	7.57
1996	6.57
1997	6.79
1998	6.25
1999	10.28
2000	12.67
2001	11.68
2002	16.13
2003	12.61
2004	16.14
2005	13.44
2006	9.78
2007	8.19
2008	6.42
2009	7.68
2010	10.12
2011	10.06
2012	11.21
2013	11.03
2014	10.6
2015	9.34
2016	8.98
2017	6.03
2018	5.26
2019	4.67
2020	4.84