Year	Percent
1997-01-01	3.0906300000000000
1998-01-01	3.0906300000000000
1999-01-01	3.0906300000000000
2000-01-01	3.0906300000000000
2001-01-01	3.0906300000000000
2002-01-01	3.0906300000000000
2003-01-01	12.0142000000000000
2004-01-01	9.2399000000000000
2005-01-01	7.2394700000000000
2006-01-01	5.4158000000000000
2007-01-01	3.5765300000000004
2008-01-01	2.8522400000000000
2009-01-01	3.3888599999999998
2010-01-01	3.2669700000000000
2011-01-01	3.8166100000000000
2012-01-01	4.0023000000000000
2013-01-01	3.8712600000000000
2014-01-01	3.6331100000000000
2015-01-01	3.5248400000000000
2016-01-01	3.4275100000000000