Year	Percent
1992	3.79
1993	4.65
1994	6.93
1995	8.11
1996	8.28
1997	10.25
1998	11.42
1999	11.55
2000	9.22
2001	7.8
2002	6.92
2003	7.05
2004	6.54
2005	6.14
2006	6.03
2007	5.09
2008	5.23
2009	7.12
2010	6.3
2011	5.61
2012	4.57
2013	4.67
2014	4.42
2015	4.77
2016	4.8
2017	4.48
2018	4.16
2019	3.97
2020	5.17