Year	Percent
1992	5.18
1993	5.88
1994	8.13
1995	9.45
1996	9.67
1997	11.81
1998	13.26
1999	13.04
2000	10.58
2001	8.98
2002	7.88
2003	8.21
2004	7.76
2005	7.12
2006	7.06
2007	6
2008	6.21
2009	8.3
2010	7.37
2011	6.54
2012	5.44
2013	5.46
2014	5.16
2015	5.57
2016	5.56
2017	5.21
2018	4.85
2019	4.5
2020	5.59