Year	Percent
1991	96.434
1992	96.626
1993	96.782
1994	96.689
1995	96.825
1996	97.055
1997	96.867
1998	96.756
1999	96.819
2000	96.833
2001	96.749
2002	96.707
2003	96.703
2004	96.638
2005	96.565
2006	96.59
2007	96.36
2008	96.459
2009	96.44
2010	96.313
2011	96.377
2012	96.339
2013	96.251
2014	96.208
2015	96.478
2016	96.397
2017	96.456
2018	96.478
2019	96.457
2020	96.423
2021	96.386
2022	96.341