Year	Percent
1997-01-01	79.41180000000000
1998-01-01	233.33300000000000
1999-01-01	85.78550000000000
2000-01-01	87.36399999999999
2001-01-01	86.58460000000000
2002-01-01	78.88450000000000
2003-01-01	73.16560000000000
2004-01-01	72.38580000000000
2005-01-01	60.82520000000000
2006-01-01	56.46970000000000
2007-01-01	41.26760000000000
2008-01-01	21.10150000000000
2009-01-01	21.96920000000000
2010-01-01	23.42570000000000
2011-01-01	17.78760000000000
2012-01-01	19.08040000000000
2013-01-01	21.09080000000000
2014-01-01	17.91480000000000
2015-01-01	21.74230000000000
2016-01-01	23.71580000000000