Year	Percent
1999-01-01	7.287489999999999
2000-01-01	6.835570000000000
2001-01-01	6.732730000000000
2002-01-01	6.573040000000000
2003-01-01	6.886350000000000
2004-01-01	8.516630000000001
2005-01-01	8.755350000000000
2006-01-01	11.211800000000000
2007-01-01	15.436100000000000
2008-01-01	15.591400000000000
2009-01-01	13.522500000000000
2010-01-01	15.403500000000000
2011-01-01	19.149000000000000
2012-01-01	18.057500000000000
2013-01-01	18.361800000000000
2014-01-01	19.820000000000000
2015-01-01	25.318500000000000
2016-01-01	24.790400000000000