Year	Percent
1991	65.542
1992	65.605
1993	65.305
1994	65.725
1995	64.413
1996	64.837
1997	63.791
1998	64.194
1999	64.129
2000	64.696
2001	64.203
2002	64.381
2003	64.197
2004	63.234
2005	63.02
2006	62.635
2007	61.545
2008	61.55
2009	61.224
2010	61.905
2011	62.125
2012	61.961
2013	62.077
2014	61.674
2015	61.51
2016	61.879
2017	62.674
2018	62.946
2019	63.032
2020	63.254
2021	63.172
2022	63.071