Year	Percent
1991	64.36
1992	65.531
1993	67.033
1994	65.625
1995	64.777
1996	66.495
1997	65.726
1998	66.41
1999	68.143
2000	66.827
2001	65.62
2002	65.759
2003	65.594
2004	65.985
2005	63.309
2006	60.424
2007	57.733
2008	56.092
2009	56.939
2010	56.037
2011	56.891
2012	56.773
2013	57.226
2014	56.868
2015	56.432
2016	56.132
2017	56.968
2018	56.58
2019	56.209
2020	55.957
2021	56.161
2022	56.193