Year	Percent
1991	87.095
1992	92.511
1993	92.585
1994	92.222
1995	92.522
1996	92.595
1997	92.369
1998	90.61
1999	90.589
2000	90.386
2001	90.194
2002	85.989
2003	85.812
2004	85.688
2005	84.761
2006	84.696
2007	82.729
2008	82.629
2009	82.308
2010	82.238
2011	82.191
2012	77.018
2013	76.873
2014	82.629
2015	82.444
2016	82.252
2017	82.23
2018	82.155
2019	82.079
2020	82.002
2021	81.931
2022	81.861