Year	Percent
1991	94.68
1992	94.914
1993	94.339
1994	94.801
1995	94.463
1996	94.266
1997	91.786
1998	91.739
1999	91.725
2000	91.509
2001	91.121
2002	91.009
2003	90.721
2004	83.503
2005	84.165
2006	84.293
2007	84.787
2008	85.096
2009	85.319
2010	85.146
2011	85.093
2012	84.857
2013	84.521
2014	84.037
2015	84.167
2016	84.422
2017	84.786
2018	84.772
2019	84.754
2020	84.735
2021	84.717
2022	84.699