Year	Percent
1991	96.839
1992	96.75
1993	97.06
1994	97.022
1995	97.175
1996	97.114
1997	97.109
1998	97.161
1999	97.066
2000	97.228
2001	97.265
2002	97.233
2003	97.494
2004	97.53
2005	97.646
2006	97.427
2007	97.023
2008	96.21
2009	95.981
2010	95.764
2011	95.863
2012	95.815
2013	95.624
2014	95.543
2015	95.351
2016	95.266
2017	95.239
2018	95.304
2019	95.423
2020	95.48
2021	95.545
2022	95.596