Year	Percent
1999-01-01	86.56200000000001
2000-01-01	72.26650000000000
2001-01-01	68.28840000000000
2002-01-01	75.23610000000000
2003-01-01	75.68420000000000
2004-01-01	71.66660000000000
2005-01-01	71.51370000000000
2006-01-01	73.68560000000000
2007-01-01	73.42690000000000
2008-01-01	72.09290000000000
2009-01-01	65.78000000000000
2010-01-01	59.92570000000000
2011-01-01	53.86720000000000
2012-01-01	50.32430000000000
2013-01-01	51.89750000000000
2014-01-01	52.74160000000000
2015-01-01	53.70950000000000
2016-01-01	52.99370000000000