Year	Percent
2000-01-01	24.78
2001-01-01	26.18
2002-01-01	23.85
2003-01-01	30.01
2004-01-01	31.29
2005-01-01	34.05
2006-01-01	39.00
2007-01-01	42.64
2008-01-01	36.51
2009-01-01	42.57
2010-01-01	42.74
2011-01-01	43.99
2012-01-01	45.79
2013-01-01	45.15
2014-01-01	46.91
2015-01-01	53.51
2016-01-01	54.71