Year	Percent
1991	95.792
1992	97.742
1993	97.741
1994	97.471
1995	97.601
1996	97.639
1997	97.549
1998	96.295
1999	96.263
2000	96.141
2001	95.992
2002	94.288
2003	94.325
2004	94.34
2005	93.695
2006	93.892
2007	91.912
2008	92.395
2009	92.454
2010	92.375
2011	92.256
2012	88.476
2013	88.295
2014	90.666
2015	90.664
2016	90.65
2017	90.64
2018	90.601
2019	90.561
2020	90.521
2021	90.484
2022	90.447