Year	Percent
1990	71.41
1991	71.41
1992	71.41
1993	71.42
1994	71.39
1995	70.69
1996	69.93
1997	69.04
1998	68.02
1999	67.48
2000	66.91
2001	66.38
2002	65.83
2003	65.26
2004	65.02
2005	64.72
2006	64.42
2007	64.12
2008	63.83
2009	63.53
2010	63.23
2011	63.03
2012	62.82
2013	63.95
2014	63.94
2015	64.33
2016	65.7
2017	66.55
2018	65.84
2019	66.66
2020	64.2