Year	Percent
1993	12.2
1994	13.65
1995	13.11
1996	11.34
1997	11.89
1998	12.19
1999	15.95
2000	19.06
2001	19.38
2002	18.72
2003	17.12
2004	18.6
2005	16.26
2006	13.37
2007	11.14
2008	9.51
2009	12.03
2010	14.38
2011	13.62
2012	13.96
2013	14.22
2014	13.18
2015	11.48
2016	9.67
2017	8.13
2018	6.54
2019	5.75
2020	6.69