Year	Percent
1991-01-01	27.313200000000000
1992-01-01	19.662400000000000
1993-01-01	8.990400000000000
1994-01-01	10.535300000000000
1995-01-01	7.359330000000000
1996-01-01	9.421380000000001
1997-01-01	9.595060000000000
1998-01-01	10.771900000000000
1999-01-01	9.857470000000000
2000-01-01	10.632800000000000
2001-01-01	11.961600000000000
2002-01-01	15.621400000000000
2003-01-01	21.711600000000000
2004-01-01	23.501200000000000
2005-01-01	25.063200000000000
2006-01-01	24.630700000000000
2007-01-01	26.694900000000000
2008-01-01	22.592900000000000
2009-01-01	26.034000000000002
2010-01-01	35.286100000000000
2011-01-01	38.190600000000000
2012-01-01	39.015000000000000
2013-01-01	40.413200000000000
2014-01-01	42.165500000000000
2015-01-01	42.461500000000000
2016-01-01	44.126200000000000