Year	Percent
1995-01-01	24.6023439200000
1996-01-01	24.8581253650000
1997-01-01	24.8239773125000
1998-01-01	24.6221286350000
1999-01-01	24.1360961875000
2000-01-01	23.8646315775000
2001-01-01	24.2071460250000
2002-01-01	23.9050850175000
2003-01-01	23.5207094425000
2004-01-01	23.3136769575000
2005-01-01	23.3667857900000
2006-01-01	23.0930031425000
2007-01-01	22.1901363250000
2008-01-01	21.9039363125000
2009-01-01	21.7713553075000
2010-01-01	21.3512016050000
2011-01-01	21.1590072325000
2012-01-01	18.1916666666667
2013-01-01	18.3000000000000
2014-01-01	17.4583333333333
2015-01-01	17.4000000000000
2016-01-01	17.3416666666667
2017-01-01	17.1916666666667