Year	Percent
1991	8.607
1992	8.576
1993	8.186
1994	8.278
1995	8.268
1996	8.418
1997	8.408
1998	8.335
1999	8.283
2000	8.713
2001	8.383
2002	7.912
2003	8.282
2004	8.894
2005	8.94
2006	9.069
2007	9.056
2008	10.02
2009	11.078
2010	13.53
2011	12.676
2012	11.845
2013	11.337
2014	11.668
2015	11.528
2016	11.469
2017	11.241
2018	11.287
2019	11.413
2020	11.536
2021	11.655
2022	11.78