Year	Percent
1999-01-01	51.425
2000-01-01	51.275
2001-01-01	52.325
2002-01-01	51.275
2003-01-01	50.650
2004-01-01	49.425
2005-01-01	48.225
2006-01-01	47.875
2007-01-01	46.875
2008-01-01	46.450
2009-01-01	46.275
2010-01-01	45.425
2011-01-01	46.150
2012-01-01	46.000
2013-01-01	45.325
2014-01-01	44.825
2015-01-01	44.925
2016-01-01	45.275
2017-01-01	45.100