Year	Percent
1991-01-01	6.5939399999999990
1992-01-01	5.6474699999999990
1993-01-01	6.5689400000000000
1994-01-01	6.7478800000000000
1995-01-01	6.3182199999999990
1996-01-01	6.4663600000000000
1997-01-01	6.7115500000000000
1998-01-01	6.9314800000000005
1999-01-01	6.9314800000000005
2000-01-01	8.6633300000000000
2001-01-01	8.7619800000000000
2002-01-01	9.5332300000000000
2003-01-01	11.6377000000000000
2004-01-01	11.2068000000000000
2005-01-01	10.7122000000000000
2006-01-01	13.2557000000000000
2007-01-01	13.9002000000000000
2008-01-01	13.1429000000000000
2009-01-01	15.7724000000000000
2010-01-01	19.8335000000000000
2011-01-01	25.2572000000000000
2012-01-01	23.3411000000000000
2013-01-01	21.5786000000000000
2014-01-01	22.9062000000000000
2015-01-01	24.9842000000000000
2016-01-01	24.7682000000000000