Year	Percent
1992	8.26
1994	8.17
1995	8.01
1996	6.74
1997	5.51
1998	5.63
1999	6.24
2000	6.97
2001	6.56
2002	8.11
2003	6.95
2004	7.72
2005	7.17
2006	7.27
2007	6.41
2008	5.79
2009	6.86
2010	6.96
2011	7.18
2012	6.79
2013	7.1
2014	6.8
2015	6.81
2016	5.9
2017	4.93
2018	4.19
2019	3.91
2020	5.03