Year	Percent
1991	85.122
1992	85.412
1993	86.108
1994	85.813
1995	85.972
1996	85.971
1997	86.062
1998	86.333
1999	86.684
2000	86.873
2001	87.729
2002	88.623
2003	88.915
2004	89.196
2005	89.486
2006	89.644
2007	89.76
2008	90.168
2009	91.094
2010	91.25
2011	90.935
2012	90.92
2013	90.971
2014	90.781
2015	90.754
2016	90.865
2017	90.771
2018	90.879
2019	91.035
2020	91.132
2021	91.221
2022	91.303