Year	Percent
1991	75.83
1992	75.13
1993	75.699
1994	75.628
1995	75.21
1996	75.177
1997	66.942
1998	75.094
1999	75.082
2000	66.896
2001	66.905
2002	62.889
2003	62.884
2004	68.789
2005	68.786
2006	74.325
2007	75.391
2008	77.856
2009	79.23
2010	79.11
2011	78.36
2012	75.07
2013	75.048
2014	73.018
2015	74.698
2016	75.222
2017	75.246
2018	75.186
2019	75.126
2020	75.065
2021	75.003
2022	74.941