Year	Percent
1991	90.282
1992	89.97
1993	90.065
1994	90.487
1995	90.464
1996	90.53
1997	90.02
1998	89.933
1999	89.466
2000	88.938
2001	89.166
2002	88.938
2003	88.966
2004	88.419
2005	88.484
2006	87.873
2007	87.244
2008	87.658
2009	87.199
2010	87.471
2011	87.361
2012	87.02
2013	86.566
2014	86.246
2015	85.916
2016	85.802
2017	85.729
2018	85.659
2019	85.59
2020	85.521
2021	85.452
2022	85.383