Year	Percent
1999-01-01	33.025
2000-01-01	34.625
2001-01-01	37.500
2002-01-01	36.700
2003-01-01	34.500
2004-01-01	42.525
2005-01-01	45.400
2006-01-01	45.775
2007-01-01	46.625
2008-01-01	46.375
2009-01-01	48.200
2010-01-01	47.550
2011-01-01	42.675
2012-01-01	43.625
2013-01-01	45.125
2014-01-01	45.700
2015-01-01	46.350
2016-01-01	47.100
2017-01-01	51.775