Year	Percent
1991	91.403
1992	90.836
1993	91.398
1994	90.926
1995	91.82
1996	92.965
1997	91.785
1998	86.871
1999	97.722
2000	94.369
2001	92.994
2002	90.703
2003	89.074
2004	86.492
2005	87.747
2006	87.347
2007	86.786
2008	87.632
2009	89.792
2010	91.334
2011	91.334
2012	91.79
2013	92.507
2014	91.983
2015	92.016
2016	91.494
2017	91.514
2018	91.31
2019	91.279
2020	91.476
2021	91.554
2022	91.636