Year	Percent
1995-01-01	37.1059736250000
1996-01-01	37.8652785375000
1997-01-01	38.4108689250000
1998-01-01	39.0424128375000
1999-01-01	39.2852321425000
2000-01-01	39.2518923825000
2001-01-01	39.3172362725000
2002-01-01	39.7993793250000
2003-01-01	39.8647914950000
2004-01-01	39.3962084050000
2005-01-01	39.3368796925000
2006-01-01	38.9247148625000
2007-01-01	38.2394859700000
2008-01-01	38.0282486025000
2009-01-01	38.2571092875000
2010-01-01	37.8387592000000
2011-01-01	40.1103144600000
2012-01-01	30.6916666666667
2013-01-01	30.6000000000000
2014-01-01	30.5583333333333
2015-01-01	30.7083333333333
2016-01-01	30.9000000000000
2017-01-01	31.0416666666667