Year	Percent
1996-01-01	39.9736
1997-01-01	39.3219
1998-01-01	42.4316
1999-01-01	42.5747
2000-01-01	41.6724
2001-01-01	41.6748
2002-01-01	41.6625
2003-01-01	43.2414
2004-01-01	42.0897
2005-01-01	42.1512
2006-01-01	43.0754
2007-01-01	40.8225
2008-01-01	38.0637
2009-01-01	40.9278
2010-01-01	36.9483
2011-01-01	36.7223
2012-01-01	38.2374
2013-01-01	37.9968
2014-01-01	36.5742