Year	Percent
1990-01-01	11.86
1991-01-01	11.86
1992-01-01	11.86
1993-01-01	11.86
1994-01-01	11.86
1995-01-01	11.86
1996-01-01	11.86
1997-01-01	11.86
1998-01-01	11.86
1999-01-01	11.86
2000-01-01	27.48
2001-01-01	37.32
2002-01-01	40.57
2003-01-01	45.80
2004-01-01	44.85
2005-01-01	44.48
2006-01-01	44.74
2007-01-01	43.82
2008-01-01	38.42
2009-01-01	44.16
2010-01-01	42.20
2011-01-01	41.26
2012-01-01	43.39
2013-01-01	42.69
2014-01-01	41.15
2015-01-01	41.54
2016-01-01	44.63