Year	Percent
1991	91.309
1992	90.399
1993	90.888
1994	90.463
1995	90.205
1996	88.934
1997	88.643
1998	87.875
1999	87.19
2000	90.198
2001	89.937
2002	89.39
2003	88.91
2004	89.14
2005	88.3
2006	87.323
2007	86.715
2008	85.936
2009	85.768
2010	84.373
2011	83.431
2012	84.952
2013	84.993
2014	84.811
2015	84.355
2016	83.275
2017	83.273
2018	83.203
2019	83.134
2020	83.065
2021	82.999
2022	82.935