Year	Percent
1991	57.627
1992	58.513
1993	59.802
1994	59.771
1995	62.133
1996	61.458
1997	60.812
1998	62.106
1999	62.981
2000	63.18
2001	63.085
2002	62.015
2003	60.973
2004	62.665
2005	62.682
2006	62.523
2007	59.563
2008	60.585
2009	61.118
2010	60.463
2011	63.036
2012	62.454
2013	63.544
2014	63.403
2015	63.622
2016	60.698
2017	61.01
2018	61.25
2019	61.464
2020	61.509
2021	61.26
2022	60.969