Year	Percent
1991	69.861
1992	72.976
1993	76.898
1994	79.884
1995	80.903
1996	83.353
1997	85.369
1998	87.186
1999	88.062
2000	89.348
2001	90.002
2002	90.627
2003	91.678
2004	92.568
2005	93.291
2006	93.5
2007	93.971
2008	94.577
2009	94.36
2010	94.724
2011	94.865
2012	95.132
2013	94.888
2014	94.798
2015	94.806
2016	94.865
2017	94.956
2018	95.02
2019	95.093
2020	95.171
2021	95.257
2022	95.332