Year	Percent
2000	86.14193
2001	85.96007
2002	82.54409
2003	84.91825
2004	83.69191
2005	83.59419
2006	83.8088
2007	83.24755
2008	83.8025
2009	83.34685
2010	81.98613
2011	83.1586
2012	83.15032
2013	82.45338
2014	82.62308
2015	82.8249
2016	82.6055
2017	81.76469