Year	Percent
1998-01-01	65.8164
1999-01-01	62.4747
2000-01-01	56.0000
2001-01-01	54.3000
2002-01-01	56.3642
2003-01-01	57.3125
2004-01-01	59.8332
2005-01-01	59.0803
2006-01-01	62.8648
2007-01-01	61.8334
2008-01-01	53.7234
2009-01-01	65.6734
2010-01-01	67.0722
2011-01-01	64.8908
2012-01-01	69.0464