Year	Percent
1996-01-01	41.8505
1997-01-01	36.9472
1998-01-01	41.3047
1999-01-01	37.3589
2000-01-01	27.2761
2001-01-01	34.1523
2002-01-01	33.9424
2003-01-01	38.0983
2004-01-01	39.3827
2005-01-01	33.7665
2006-01-01	28.2360
2007-01-01	40.0629
2008-01-01	28.8777
2009-01-01	26.0987
2010-01-01	27.9921
2011-01-01	22.1919
2012-01-01	23.8086
2013-01-01	25.1733
2014-01-01	26.8546
2015-01-01	17.9538
2016-01-01	16.2726