Year	Percent
1991	84.615
1992	84.615
1993	84.558
1994	84.526
1995	84.464
1996	84.496
1997	84.514
1998	84.478
1999	84.441
2000	84.693
2001	84.833
2002	83.593
2003	83.478
2004	83.679
2005	85.617
2006	87.181
2007	86.053
2008	85.155
2009	84.244
2010	82.637
2011	82.367
2012	86.072
2013	81.214
2014	82.372
2015	83.789
2016	83.045
2017	83.137
2018	83.215
2019	83.298
2020	83.412
2021	83.556
2022	83.716