Year	Percent
2000-01-01	73.5
2001-01-01	67.5
2002-01-01	62.3
2003-01-01	57
2004-01-01	60.2
2005-01-01	51
2006-01-01	76.2
2007-01-01	74.6
2008-01-01	92.1
2009-01-01	100.4
2010-01-01	92.5
2011-01-01	94.6
2012-01-01	97.1
2013-01-01	99.8
2014-01-01	98.9
2015-01-01	99.0