Year	Percent
1991-01-01	47.9650001525879
1992-01-01	50.2900009155273
1993-01-01	46.1759986877441
1994-01-01	47.2369995117188
1995-01-01	43.7039985656738
1996-01-01	47.8829994201660
1997-01-01	45.2540016174316
1998-01-01	41.5579986572266
1999-01-01	54.0200004577637
2000-01-01	56.7120018005371
2001-01-01	52.2659988403320
2002-01-01	47.2480010986328
2003-01-01	49.8819999694824
2004-01-01	43.9879989624023
2005-01-01	44.1660003662109
2006-01-01	45.3950004577637
2007-01-01	45.1090011596680
2008-01-01	44.3440017700195
2009-01-01	44.7389984130859
2010-01-01	50.1629981994629
2011-01-01	48.2270011901855
2012-01-01	51.2280006408691
2013-01-01	49.9230003356934
2014-01-01	49.7729988098145
2015-01-01	48.3359985351563
2016-01-01	47.9150009155273
2017-01-01	48.3540000915527