Year	Percent
1994	17.33
1995	17.54
1996	16.4
1997	14.13
1998	13.71
1999	13.39
2000	15.93
2001	16.84
2002	13.01
2003	12.87
2004	10.68
2005	8.32
2006	5.78
2007	4.25
2008	5.83
2009	13.79
2010	17.81
2011	15.39
2012	13.36
2013	11.77
2014	10.7
2015	9.12
2016	7.86
2017	7.07
2018	6.15
2019	6.26
2020	8.49