Year	Percent
1995-01-01	49.38
1996-01-01	49.72
1997-01-01	49.42
1998-01-01	48.59
1999-01-01	47.58
2000-01-01	47.24
2001-01-01	47.33
2002-01-01	47.73
2003-01-01	47.35
2004-01-01	47.17
2005-01-01	48.03
2006-01-01	48.51
2007-01-01	49.27
2008-01-01	49.89
2009-01-01	49.00
2010-01-01	48.06
2011-01-01	48.26