Year	Percent
1996-01-01	72.37570000000000
1997-01-01	62.28130000000000
1998-01-01	66.57390000000000
1999-01-01	72.69800000000001
2000-01-01	73.99710000000000
2001-01-01	73.69700000000000
2002-01-01	68.06500000000000
2003-01-01	72.91920000000000
2004-01-01	70.16930000000000
2005-01-01	73.07460000000000
2006-01-01	68.65170000000000
2007-01-01	68.59300000000000
2008-01-01	66.70420000000000
2009-01-01	31.24650000000000
2010-01-01	32.09730000000000
2011-01-01	32.09590000000000
2012-01-01	27.42510000000000
2013-01-01	22.67470000000000
2014-01-01	20.73260000000000
2015-01-01	18.88410000000000
2016-01-01	17.31760000000000