Year	Percent
1991-01-01	42.0610008239746
1992-01-01	42.9949989318848
1993-01-01	43.2249984741211
1994-01-01	41.0050010681152
1995-01-01	39.6440010070801
1996-01-01	41.6319999694824
1997-01-01	42.4690017700195
1998-01-01	41.1100006103516
1999-01-01	43.8310012817383
2000-01-01	44.0550003051758
2001-01-01	44.4389991760254
2002-01-01	44.5999984741211
2003-01-01	44.8209991455078
2004-01-01	45.5130004882813
2005-01-01	45.2080001831055
2006-01-01	45.5229988098145
2007-01-01	45.4140014648438
2008-01-01	45.1150016784668
2009-01-01	45.3279991149902
2010-01-01	45.3370018005371
2011-01-01	45.3639984130859
2012-01-01	44.7350006103516
2013-01-01	44.6790008544922
2014-01-01	44.4580001831055
2015-01-01	44.3400001525879
2016-01-01	44.4729995727539
2017-01-01	44.4239997863770