Year	Percent
1996-01-01	80.5538
1997-01-01	76.9644
1998-01-01	73.4020
1999-01-01	73.5876
2000-01-01	70.9515
2001-01-01	67.5874
2002-01-01	67.7099
2003-01-01	64.1820
2004-01-01	65.2303
2005-01-01	65.5504
2006-01-01	68.1307
2007-01-01	78.4237
2008-01-01	77.8034
2009-01-01	58.0433
2010-01-01	68.6571
2011-01-01	70.8129
2012-01-01	65.4491
2013-01-01	67.6212
2014-01-01	78.0572