Year	Percent
1991	7.763
1992	8.125
1993	7.765
1994	8.202
1995	8.421
1996	8.208
1997	9.197
1998	8.793
1999	8.904
2000	8.731
2001	8.855
2002	8.984
2003	9.129
2004	9.01
2005	8.905
2006	8.914
2007	8.7
2008	8.743
2009	8.734
2010	8.57
2011	8.556
2012	8.938
2013	9.057
2014	9.295
2015	9.174
2016	9.148
2017	9.127
2018	9.067
2019	9.017
2020	8.974
2021	8.93
2022	8.894