Year	Percent
1997-01-01	76.0274
1998-01-01	72.2581
1999-01-01	72.2581
2000-01-01	84.1121
2001-01-01	84.1121
2002-01-01	84.1121
2003-01-01	84.1121
2004-01-01	84.1121
2005-01-01	83.9915
2006-01-01	71.5177
2007-01-01	76.0750
2008-01-01	72.6942