Year	Percent
1996-01-01	61.3275
1997-01-01	53.0413
1998-01-01	58.4479
1999-01-01	58.0291
2000-01-01	57.8270
2001-01-01	56.0376
2002-01-01	54.7463
2003-01-01	55.1971
2004-01-01	57.2141
2005-01-01	57.0395
2006-01-01	54.7198
2007-01-01	53.3583
2008-01-01	54.2468
2009-01-01	55.0223
2010-01-01	55.2354
2011-01-01	56.6281
2012-01-01	58.1826
2013-01-01	58.8684
2014-01-01	59.0093
2015-01-01	67.6812
2016-01-01	60.3467