Year	Percent
1997-01-01	32.505200000000000
1998-01-01	47.431999999999995
1999-01-01	47.307400000000000
2000-01-01	34.710400000000000
2001-01-01	3.406260000000000
2002-01-01	8.190090000000000
2003-01-01	23.983200000000000
2004-01-01	10.335000000000000
2005-01-01	20.224900000000000
2006-01-01	34.886800000000000
2007-01-01	37.027100000000000
2008-01-01	74.940500000000000
2009-01-01	66.307200000000000
2010-01-01	51.800900000000000
2011-01-01	75.417000000000000
2012-01-01	81.318800000000000
2013-01-01	81.192300000000000
2014-01-01	69.862900000000000