Year	Percent
1991	79.102
1992	79.048
1993	79.019
1994	79.012
1995	78.987
1996	78.993
1997	78.999
1998	79.019
1999	79.037
2000	79.061
2001	79.484
2002	79.813
2003	80.195
2004	81.147
2005	82.133
2006	82.596
2007	82.972
2008	83.262
2009	83.516
2010	83.622
2011	84.825
2012	86.012
2013	84.879
2014	83.625
2015	81.949
2016	81.845
2017	82.037
2018	82.236
2019	82.438
2020	82.595
2021	82.753
2022	82.915