Year	Percent
1991	13.501
1992	13.56
1993	12.267
1994	12.071
1995	12.937
1996	9.842
1997	10.112
1998	9.601
1999	9.687
2000	9.522
2001	9.77
2002	9.184
2003	9.739
2004	8.678
2005	9.485
2006	10.008
2007	10.635
2008	11.531
2009	10.815
2010	11.613
2011	11.942
2012	11.429
2013	13.679
2014	13.627
2015	12.897
2016	12.583
2017	12.523
2018	12.448
2019	12.349
2020	12.205
2021	12.063
2022	11.975