Year	Percent
1998-01-01	51.9663
1999-01-01	58.3643
2000-01-01	55.7000
2001-01-01	45.8000
2002-01-01	46.5052
2003-01-01	52.6689
2004-01-01	55.7379
2005-01-01	52.3244
2006-01-01	50.6870
2007-01-01	54.6252
2008-01-01	42.2175
2009-01-01	47.9548
2010-01-01	51.8956
2011-01-01	44.4342
2012-01-01	46.8947
2013-01-01	51.6722
2014-01-01	49.3247
2015-01-01	49.1193
2016-01-01	48.3591