Year	Percent
1991	7.33
1992	7.19
1993	7.087
1994	7.691
1995	7.589
1996	7.434
1997	7.503
1998	7.384
1999	7.445
2000	8.665
2001	7.649
2002	7.565
2003	7.611
2004	7.793
2005	8
2006	8.525
2007	8.748
2008	9.841
2009	10.627
2010	10.138
2011	9.013
2012	8.272
2013	8.692
2014	8.873
2015	8.941
2016	8.955
2017	8.669
2018	8.735
2019	8.701
2020	8.71
2021	8.708
2022	8.741