Year	Percent
1991	10.087
1992	10.613
1993	11.226
1994	11.464
1995	11.647
1996	12.252
1997	13.245
1998	13.352
1999	12.934
2000	12.364
2001	11.214
2002	11.539
2003	11.433
2004	11.314
2005	11.517
2006	11.423
2007	11.463
2008	11.439
2009	11.914
2010	11.577
2011	11.519
2012	11.508
2013	11.818
2014	11.72
2015	11.959
2016	11.77
2017	11.704
2018	11.507
2019	11.385
2020	11.354
2021	11.336
2022	11.3