Year	Percent
1998-01-01	31.1316
1999-01-01	34.3837
2000-01-01	31.6001
2001-01-01	53.9062
2002-01-01	56.2080
2003-01-01	65.9817
2004-01-01	54.7945
2005-01-01	29.2412
2006-01-01	29.8825
2007-01-01	29.1036
2008-01-01	30.2273
2009-01-01	27.4902
2010-01-01	24.9124
2011-01-01	24.1955
2012-01-01	25.2569
2013-01-01	24.4233
2014-01-01	27.6071