Year	Percent
1997-01-01	10.6223000000000000
1998-01-01	15.2436000000000000
1999-01-01	18.2089000000000000
2000-01-01	18.2089000000000000
2001-01-01	18.2089000000000000
2002-01-01	38.8202000000000000
2003-01-01	25.5096000000000000
2004-01-01	22.6216000000000000
2005-01-01	23.6004000000000000
2006-01-01	22.6799000000000000
2007-01-01	25.9183000000000000
2008-01-01	28.4885000000000000
2009-01-01	22.3175000000000000
2010-01-01	21.6396000000000000
2011-01-01	26.7085000000000000
2012-01-01	6.9026000000000000
2013-01-01	2.1812400000000003
2014-01-01	12.3522000000000000
2015-01-01	16.2188000000000000
2016-01-01	11.1328000000000000