Year	Percent
1997-01-01	0.028114
1998-01-01	0.041665
1999-01-01	27.899000
2000-01-01	31.807600
2001-01-01	31.050700
2002-01-01	40.063900
2003-01-01	43.301000
2004-01-01	52.260100
2005-01-01	55.199100
2006-01-01	67.807900
2007-01-01	78.351100
2008-01-01	70.151800
2009-01-01	76.476900
2010-01-01	59.133600
2011-01-01	46.596300
2012-01-01	46.259600
2013-01-01	46.491500
2014-01-01	40.772500
2015-01-01	40.762300
2016-01-01	35.849100