Year	Percent
1991	85.634
1992	85.658
1993	85.714
1994	85.755
1995	86.019
1996	86.229
1997	86.076
1998	86.184
1999	86.114
2000	85.996
2001	86.023
2002	86.054
2003	86.079
2004	86.153
2005	86.158
2006	86.145
2007	86.093
2008	86.108
2009	86.114
2010	86.234
2011	86.269
2012	86.287
2013	86.29
2014	86.313
2015	86.333
2016	86.352
2017	86.335
2018	86.381
2019	86.327
2020	86.271
2021	86.21
2022	86.149