Year	Percent
1992	77.88257
1993	77.60243
1994	77.62599
1995	77.61919
1996	77.61919
1997	77.64277
1998	77.66636
1999	77.72036
2000	77.37226
2001	77.22019
2002	77.06813
2003	76.90904
2004	76.70316
2005	75.98054
2006	75.49407
2007	75.55488
2008	75.43326
2009	75.15962
2010	75.03805
2011	74.94673
2012	74.86306
2013	74.84793
2014	70.40754
2015	70.49878
2016	70.49574
2017	70.45607
2018	68.63553
2019	68.77111
2020	68.86506
2021	69.00212