Year	Percent
1996-01-01	48.7695
1997-01-01	49.8826
1998-01-01	24.2105
1999-01-01	44.4977
2000-01-01	41.4018
2001-01-01	29.8926
2002-01-01	36.8217
2003-01-01	38.2971
2004-01-01	31.4410
2005-01-01	39.5746
2006-01-01	36.4204
2007-01-01	45.9859
2008-01-01	31.8440
2009-01-01	43.5236
2010-01-01	43.1039
2011-01-01	61.8631
2012-01-01	34.5593
2013-01-01	28.7574
2014-01-01	32.2131