Year	Percent
1991	81.742
1992	81.816
1993	82.505
1994	83.563
1995	83.935
1996	85.04
1997	84.905
1998	85.345
1999	85.379
2000	85.678
2001	86.487
2002	86.705
2003	86.589
2004	86.81
2005	86.761
2006	86.626
2007	86.14
2008	86.906
2009	84.98
2010	85.521
2011	86.203
2012	86.835
2013	88.55
2014	87.871
2015	84.875
2016	83.072
2017	82.676
2018	83.062
2019	83.474
2020	83.591
2021	83.944
2022	84.119