Year	Percent
1997-01-01	8.123289999999999
1998-01-01	7.953700000000000
1999-01-01	10.807000000000000
2000-01-01	14.878700000000000
2001-01-01	16.845700000000000
2002-01-01	17.487800000000000
2003-01-01	17.729600000000000
2004-01-01	15.955000000000000
2005-01-01	11.803400000000000
2006-01-01	9.032110000000001
2007-01-01	7.424919999999999
2008-01-01	5.048440000000000
2009-01-01	8.293880000000000
2010-01-01	9.042160000000000
2011-01-01	10.949600000000000
2012-01-01	14.623400000000000
2013-01-01	20.425600000000000
2014-01-01	21.749600000000000
2015-01-01	26.395900000000000
2016-01-01	24.888100000000000