Year	Percent
1998-01-01	82.55078125
1999-01-01	73.40137482
2000-01-01	42.14445114
2001-01-01	54.37429428
2002-01-01	83.45092010
2003-01-01	77.29796600
2004-01-01	65.14794922
2005-01-01	64.12621307
2006-01-01	53.87226868
2007-01-01	47.65935898
2008-01-01	49.90194321
2009-01-01	52.45511246
2010-01-01	48.80149841
2011-01-01	46.20570374
2012-01-01	58.38332748
2013-01-01	56.28647995