Year	Percent
1991	9.354
1992	9.178
1993	8.637
1994	9.115
1995	8.966
1996	8.375
1997	8.805
1998	8.968
1999	8.787
2000	8.865
2001	9.083
2002	9.142
2003	9.031
2004	9.107
2005	8.929
2006	9.126
2007	9.602
2008	9.605
2009	9.49
2010	9.641
2011	9.676
2012	9.806
2013	9.992
2014	10.05
2015	9.685
2016	9.963
2017	9.818
2018	9.764
2019	9.822
2020	9.89
2021	9.968
2022	10.059