Year	Percent
1991	60.975
1992	60.761
1993	61.329
1994	60.161
1995	60.548
1996	60.382
1997	60.271
1998	62.972
1999	62.99
2000	61.369
2001	62.648
2002	64.096
2003	63.44
2004	63.727
2005	63.02
2006	61.892
2007	61.39
2008	60.447
2009	59.739
2010	60.053
2011	61.035
2012	61.689
2013	61.571
2014	61.723
2015	62.021
2016	61.354
2017	63.657
2018	63.431
2019	63.271
2020	63.047
2021	62.865
2022	62.691