Year	Percent
1991	60.161
1992	57.679
1993	57.609
1994	57.487
1995	56.808
1996	57.482
1997	60.655
1998	60.404
1999	63.405
2000	65.405
2001	67.354
2002	59.936
2003	62.357
2004	62.554
2005	61.135
2006	58.816
2007	60.401
2008	60.342
2009	59.247
2010	60.333
2011	62.397
2012	64.78
2013	64.815
2014	66.606
2015	66.041
2016	65.506
2017	65.313
2018	65.106
2019	64.876
2020	64.632
2021	64.384
2022	64.114