Year	Percent
1996-01-01	62.7431
1997-01-01	57.3302
1998-01-01	47.5583
1999-01-01	40.4161
2000-01-01	43.4573
2001-01-01	64.5287
2002-01-01	80.2236
2003-01-01	67.8687
2004-01-01	73.3234
2005-01-01	58.6869
2006-01-01	69.2695
2007-01-01	67.6202
2008-01-01	74.2077
2009-01-01	68.9414
2010-01-01	69.7741
2011-01-01	76.8492
2012-01-01	80.1031
2013-01-01	79.1631
2014-01-01	82.4886
2015-01-01	65.5889
2016-01-01	60.4078