Year	Percent
1991	66.66
1992	65.915
1993	66.483
1994	66.41
1995	65.754
1996	65.828
1997	63.533
1998	64.656
1999	64.698
2000	64.421
2001	64.419
2002	60.131
2003	60.155
2004	62.027
2005	62.113
2006	62.575
2007	62.354
2008	63.784
2009	63.272
2010	63.338
2011	62.881
2012	60.243
2013	60.123
2014	60.047
2015	60.387
2016	61.064
2017	61.111
2018	61.061
2019	61.012
2020	60.962
2021	60.914
2022	60.867