Year	Percent
1997-01-01	43.7069
1998-01-01	42.9050
1999-01-01	78.3888
2000-01-01	59.5572
2001-01-01	51.5773
2002-01-01	51.5773
2003-01-01	57.3189
2004-01-01	63.7287
2005-01-01	55.7922
2006-01-01	45.5984
2007-01-01	47.1186
2008-01-01	58.3828
2009-01-01	60.5425
2010-01-01	77.2242
2011-01-01	67.1499
2012-01-01	69.9123
2013-01-01	54.6947
2014-01-01	50.8059