Year	Percent
1997-01-01	100.00000000000000
1998-01-01	100.00000000000000
1999-01-01	93.58780000000000
2000-01-01	84.85920000000000
2001-01-01	84.07920000000000
2002-01-01	86.10010000000000
2003-01-01	77.45100000000001
2004-01-01	77.97830000000000
2005-01-01	77.16730000000000
2006-01-01	74.88910000000000
2007-01-01	65.46200000000000
2008-01-01	66.28320000000000
2009-01-01	65.51760000000000
2010-01-01	64.63210000000000
2011-01-01	64.99020000000000
2012-01-01	34.93550000000000
2013-01-01	36.30260000000000
2014-01-01	39.47480000000000
2015-01-01	46.93520000000000
2016-01-01	44.36240000000000