Year	Percent
1990	62.02
1991	62.07
1992	62.51
1993	62.93
1994	63.35
1995	63.77
1996	62.41
1997	63.08
1998	63.28
1999	63.86
2000	64.1
2001	64.33
2002	65.03
2003	65.05
2004	65.74
2005	66.37
2006	65.96
2007	65.65
2008	65.64
2009	65.85
2010	64.73
2011	63.59
2012	64.29
2013	64.17
2014	63.9
2015	64.05
2016	63.79
2017	64.06
2018	64.05
2019	64.46
2020	59.24