Year	Percent
1991	11.98
1992	6.987
1993	8.239
1994	8.624
1995	8.893
1996	9.46
1997	7.883
1998	8.875
1999	8.926
2000	8.104
2001	7.38
2002	6.805
2003	8.381
2004	9.798
2005	7.956
2006	8.173
2007	9.188
2008	7.9
2009	8.385
2010	8.505
2011	8.759
2012	8.899
2013	9.175
2014	9.147
2015	9.377
2016	9.496
2017	9.722
2018	9.699
2019	9.644
2020	9.637
2021	9.633
2022	9.63