Year	Percent
1998-01-01	47.952300000000000
1999-01-01	35.611999999999995
2000-01-01	56.347400000000000
2001-01-01	41.909700000000000
2002-01-01	34.534500000000000
2003-01-01	41.581800000000000
2004-01-01	53.577000000000000
2005-01-01	49.362600000000000
2006-01-01	53.103900000000000
2007-01-01	51.429500000000000
2008-01-01	39.634100000000000
2009-01-01	29.976600000000000
2010-01-01	34.924000000000000
2011-01-01	35.838700000000000
2012-01-01	44.834800000000000
2013-01-01	47.202500000000000
2014-01-01	49.751900000000000