Year	Percent
1996-01-01	67.8899
1997-01-01	62.5521
1998-01-01	55.7342
1999-01-01	43.7058
2000-01-01	51.2037
2001-01-01	51.8624
2002-01-01	71.8175
2003-01-01	74.6655
2004-01-01	78.2772
2005-01-01	84.0790
2006-01-01	80.3529
2007-01-01	55.2331
2008-01-01	36.8827
2009-01-01	32.1871
2010-01-01	34.7757
2011-01-01	31.6598
2012-01-01	36.0131
2013-01-01	28.6435
2014-01-01	25.4045
2015-01-01	31.7501
2016-01-01	35.8903