Year	Percent
1997-01-01	58.9200
1998-01-01	44.7062
1999-01-01	42.7142
2000-01-01	42.7142
2001-01-01	30.4000
2002-01-01	17.0934
2003-01-01	12.7395
2004-01-01	11.9270
2005-01-01	13.1202
2006-01-01	11.5000
2007-01-01	7.0500
2008-01-01	8.8067
2009-01-01	6.7200
2010-01-01	5.9700
2011-01-01	7.4100
2012-01-01	7.6300
2013-01-01	9.1500
2014-01-01	8.0000