Year	Percent
1991	11.511
1992	10.937
1993	10.624
1994	10.116
1995	9.898
1996	9.468
1997	8.903
1998	8.402
1999	8.007
2000	7.662
2001	6.978
2002	7.09
2003	10.059
2004	7.499
2005	6.296
2006	5.962
2007	7.252
2008	6.414
2009	6.818
2010	6.282
2011	6.167
2012	6.369
2013	6.314
2014	6.968
2015	7.131
2016	6.181
2017	6.084
2018	6.063
2019	6.037
2020	6.018
2021	6
2022	5.985