Year	Percent
1998-01-01	50.6308
1999-01-01	40.4865
2000-01-01	31.6000
2001-01-01	47.3000
2002-01-01	51.8231
2003-01-01	42.9190
2004-01-01	62.5185
2005-01-01	56.8513
2006-01-01	42.8711
2007-01-01	52.6667
2008-01-01	54.8872
2009-01-01	66.4215
2010-01-01	87.2886
2011-01-01	74.5590
2012-01-01	52.0033
2013-01-01	75.5201
2014-01-01	78.8062
2015-01-01	75.9255
2016-01-01	70.9071