Year	Percent
1996-01-01	28.993900000000000
1997-01-01	27.754600000000000
1998-01-01	24.616100000000000
1999-01-01	27.334700000000000
2000-01-01	27.480100000000000
2001-01-01	28.885800000000000
2002-01-01	30.438000000000002
2003-01-01	26.991400000000000
2004-01-01	27.028500000000000
2005-01-01	30.485800000000000
2006-01-01	25.985300000000000
2007-01-01	21.848200000000000
2008-01-01	25.075800000000000
2009-01-01	22.427200000000000
2010-01-01	37.158300000000000
2011-01-01	26.329700000000000
2012-01-01	29.797700000000000
2013-01-01	30.098700000000000
2014-01-01	26.264500000000000
2015-01-01	31.672500000000000
2016-01-01	28.835800000000000