Year	Percent
1991	80.108
1992	80.87
1993	83.582
1994	85.375
1995	84.774
1996	87.482
1997	88.25
1998	89.226
1999	89.159
2000	89.657
2001	89.574
2002	90.432
2003	87.913
2004	88.252
2005	88.685
2006	88.913
2007	89.195
2008	89.493
2009	89.991
2010	90.314
2011	89.772
2012	90.295
2013	90.903
2014	91.533
2015	91.776
2016	91.806
2017	92.031
2018	92.204
2019	92.36
2020	92.515
2021	92.642
2022	92.742