Year	Percent
1996-01-01	50.2314
1997-01-01	53.9806
1998-01-01	53.9787
1999-01-01	51.1333
2000-01-01	49.6173
2001-01-01	51.4569
2002-01-01	50.9454
2003-01-01	47.6258
2004-01-01	50.3621
2005-01-01	41.7488
2006-01-01	51.3176
2007-01-01	56.8154
2008-01-01	39.3650
2009-01-01	47.3593
2010-01-01	37.8395
2011-01-01	51.8818
2012-01-01	44.2350
2013-01-01	42.8349
2014-01-01	38.5431