Year	Percent
1991	4.89
1992	9.9
1993	9.96
1994	11.54
1995	12.18
1996	8.69
1997	8.11
1998	7.01
1999	4.29
2000	4.39
2001	5.07
2002	6.35
2003	12.45
2004	12.11
2005	7.37
2006	8.29
2007	7.01
2008	8.2
2009	15.86
2010	16.23
2011	14.44
2012	13.53
2013	10.64
2014	9.79
2015	8.82
2016	6.51
2017	7.87
2018	6.08
2019	8.74
2020	10.03