Year	Percent
1996-01-01	78.2490
1997-01-01	66.7925
1998-01-01	63.0894
1999-01-01	59.5819
2000-01-01	58.8430
2001-01-01	59.7904
2002-01-01	45.9383
2003-01-01	46.5041
2004-01-01	47.5685
2005-01-01	44.4947
2006-01-01	43.5375
2007-01-01	46.3967
2008-01-01	28.1399
2009-01-01	30.4750
2010-01-01	28.7011
2011-01-01	28.4116
2012-01-01	27.7911
2013-01-01	28.5071
2014-01-01	28.5194
2015-01-01	27.2347
2016-01-01	25.0826