Year	Percent
1996-01-01	74.13600000000001
1997-01-01	75.03920000000000
1998-01-01	75.57180000000000
1999-01-01	82.32830000000000
2000-01-01	81.61730000000000
2001-01-01	80.24570000000000
2002-01-01	78.91510000000000
2003-01-01	79.47430000000000
2004-01-01	77.88550000000000
2005-01-01	76.33270000000000
2006-01-01	76.32990000000000
2007-01-01	78.09640000000000
2008-01-01	77.58140000000000
2009-01-01	79.78940000000000
2010-01-01	80.11320000000000
2011-01-01	80.79820000000000
2012-01-01	79.88190000000000
2013-01-01	79.15380000000000
2014-01-01	77.79250000000000
2015-01-01	77.32470000000000
2016-01-01	77.57670000000000