Year	Percent
1991	57.671
1992	58.64
1993	59.343
1994	59.769
1995	57.827
1996	59.556
1997	60.33
1998	59.934
1999	60.074
2000	59.552
2001	60.734
2002	61.862
2003	63.298
2004	63.9
2005	63.229
2006	63.098
2007	62.703
2008	63.018
2009	64.205
2010	63.576
2011	63.661
2012	64.773
2013	64.494
2014	65.123
2015	66.08
2016	66.291
2017	66.061
2018	66.281
2019	66.489
2020	66.692
2021	66.882
2022	67.081