Year	Percent
1991-01-01	53.4119987487793
1992-01-01	53.2949981689453
1993-01-01	53.5970001220703
1994-01-01	53.4199981689453
1995-01-01	53.2430000305176
1996-01-01	53.1100006103516
1997-01-01	52.9840011596680
1998-01-01	52.8530006408691
1999-01-01	52.7579994201660
2000-01-01	52.6290016174316
2001-01-01	52.6360015869141
2002-01-01	52.6489982604980
2003-01-01	52.6010017395020
2004-01-01	52.3300018310547
2005-01-01	52.3959999084473
2006-01-01	52.4690017700195
2007-01-01	52.5499992370605
2008-01-01	52.6389999389648
2009-01-01	52.7290000915527
2010-01-01	52.8180007934570
2011-01-01	52.9039993286133
2012-01-01	52.9860000610352
2013-01-01	53.0610008239746
2014-01-01	52.5810012817383
2015-01-01	52.7239990234375
2016-01-01	51.2569999694824
2017-01-01	51.2630004882813