Year	Percent
1991	7.591
1992	7.807
1993	7.715
1994	9.006
1995	7.677
1996	7.623
1997	7.846
1998	9.25
1999	9.366
2000	9.056
2001	9.355
2002	9.041
2003	8.973
2004	10.059
2005	10.46
2006	8.545
2007	8.28
2008	8.513
2009	9.14
2010	9.19
2011	9.224
2012	10.095
2013	9.9
2014	9.908
2015	9.302
2016	8.851
2017	8.823
2018	8.841
2019	8.81
2020	8.846
2021	8.881
2022	8.918