Year	Percent
1996-01-01	71.2044
1997-01-01	70.4097
1998-01-01	61.4147
1999-01-01	63.8331
2000-01-01	55.3561
2001-01-01	68.8215
2002-01-01	70.8845
2003-01-01	76.9577
2004-01-01	80.3452
2005-01-01	84.4409
2006-01-01	86.7703
2007-01-01	80.5299
2008-01-01	76.0570
2009-01-01	74.0285
2010-01-01	70.2598
2011-01-01	80.5359
2012-01-01	79.5940
2013-01-01	84.3784
2014-01-01	83.6418
2015-01-01	80.5321
2016-01-01	73.4116