Year	Percent
1991	93.064
1992	92.119
1993	91.904
1994	90.763
1995	83.879
1996	83.664
1997	83.18
1998	83.794
1999	82.967
2000	82.257
2001	81.246
2002	79.954
2003	79.396
2004	79.638
2005	79.963
2006	79.027
2007	86.013
2008	86.012
2009	85.758
2010	76.987
2011	83.254
2012	84.729
2013	84.079
2014	84.024
2015	84.144
2016	84.349
2017	84.369
2018	84.258
2019	84.196
2020	84.138
2021	84.084
2022	84.044