Year	Percent
1999-01-01	48.050
2000-01-01	47.425
2001-01-01	47.000
2002-01-01	47.425
2003-01-01	47.100
2004-01-01	47.450
2005-01-01	48.675
2006-01-01	49.275
2007-01-01	49.375
2008-01-01	49.025
2009-01-01	49.700
2010-01-01	49.200
2011-01-01	49.850
2012-01-01	49.300
2013-01-01	48.950
2014-01-01	48.925
2015-01-01	48.050
2016-01-01	47.450
2017-01-01	47.350