Year	Percent
1991	78.882
1992	76.495
1993	71.923
1994	69.46
1995	70.142
1996	69.092
1997	75.222
1998	75.714
1999	75.609
2000	74.875
2001	74.481
2002	75.917
2003	77.601
2004	80.233
2005	81.693
2006	82.231
2007	81.714
2008	80.718
2009	84.931
2010	85.542
2011	86.069
2012	87.866
2013	89.418
2014	87.408
2015	84.33
2016	84.194
2017	84.157
2018	84.506
2019	84.854
2020	85.228
2021	85.499
2022	85.788