Year	Percent
1991-01-01	60.530400000000000
1992-01-01	68.288500000000000
1993-01-01	61.170000000000000
1994-01-01	48.321900000000000
1995-01-01	31.762800000000000
1996-01-01	33.898700000000000
1997-01-01	19.970500000000000
1998-01-01	7.778910000000001
1999-01-01	10.417800000000000
2000-01-01	11.130900000000000
2001-01-01	12.575500000000000
2002-01-01	16.009100000000000
2003-01-01	21.228700000000000
2004-01-01	28.511000000000000
2005-01-01	34.705800000000000
2006-01-01	39.290700000000000
2007-01-01	47.123600000000000
2008-01-01	60.650900000000000
2009-01-01	68.653100000000000
2010-01-01	67.887100000000000
2011-01-01	64.744900000000000
2012-01-01	65.413900000000000
2013-01-01	65.964700000000000
2014-01-01	61.976800000000000
2015-01-01	55.810600000000000
2016-01-01	52.080600000000000