Year	Percent
1997-01-01	0.009916
1998-01-01	0.011676
1999-01-01	28.775000
2000-01-01	31.839600
2001-01-01	38.056000
2002-01-01	46.760600
2003-01-01	45.755700
2004-01-01	55.661300
2005-01-01	56.680500
2006-01-01	76.543300
2007-01-01	90.430400
2008-01-01	66.199100
2009-01-01	78.864200
2010-01-01	70.694700
2011-01-01	56.555900
2012-01-01	58.878700
2013-01-01	56.930100
2014-01-01	53.812700
2015-01-01	68.605900
2016-01-01	71.910900