Year	Percent
1991	69.161
1992	65.29
1993	60.947
1994	60.573
1995	61.77
1996	60.944
1997	60.271
1998	61.047
1999	61.733
2000	62.613
2001	63.973
2002	63.626
2003	62.941
2004	62.487
2005	62.706
2006	62.833
2007	63.739
2008	63.905
2009	61.53
2010	61.567
2011	62.098
2012	61.726
2013	62.067
2014	62.037
2015	62.235
2016	62.402
2017	62.657
2018	62.931
2019	62.919
2020	62.733
2021	62.504
2022	62.262