Year	Percent
1996-01-01	81.7475
1997-01-01	72.1974
1998-01-01	52.0678
1999-01-01	60.2469
2000-01-01	65.8252
2001-01-01	65.6860
2002-01-01	74.3248
2003-01-01	79.9032
2004-01-01	68.5811
2005-01-01	67.8833
2006-01-01	56.0995
2007-01-01	61.4473
2008-01-01	43.7580
2009-01-01	41.0546
2010-01-01	34.9811
2011-01-01	36.0896
2012-01-01	44.3900
2013-01-01	57.0930
2014-01-01	56.0685
2015-01-01	33.2523
2016-01-01	38.6412