Year	Percent
1996-01-01	62.9123
1997-01-01	59.2382
1998-01-01	51.5537
1999-01-01	51.4738
2000-01-01	56.7047
2001-01-01	64.9065
2002-01-01	69.3511
2003-01-01	78.8185
2004-01-01	79.7043
2005-01-01	73.4551
2006-01-01	68.2636
2007-01-01	70.1260
2008-01-01	59.9383
2009-01-01	57.0434
2010-01-01	36.1307
2011-01-01	39.3765
2012-01-01	19.7208
2013-01-01	25.6422
2014-01-01	21.6184
2015-01-01	13.0121
2016-01-01	13.5230