Year	Percent
2000-01-01	11.31
2001-01-01	12.51
2002-01-01	13.05
2003-01-01	15.58
2004-01-01	17.17
2005-01-01	17.54
2006-01-01	19.70
2007-01-01	24.45
2008-01-01	16.40
2009-01-01	26.04
2010-01-01	27.61
2011-01-01	27.36
2012-01-01	30.36
2013-01-01	32.94
2014-01-01	31.00
2015-01-01	29.94
2016-01-01	29.14