Year	Percent
1991	82.181
1992	82.719
1993	83.112
1994	84.535
1995	84.679
1996	84.873
1997	85.665
1998	85.971
1999	86.684
2000	87.273
2001	87.945
2002	88.503
2003	89.182
2004	89.876
2005	89.89
2006	89.911
2007	89.819
2008	89.863
2009	91.763
2010	91.971
2011	91.829
2012	91.667
2013	91.718
2014	91.352
2015	91.686
2016	91.778
2017	91.853
2018	91.966
2019	92.062
2020	92.155
2021	92.264
2022	92.368