Year	Percent
1991-01-01	15.5390000000000010
1992-01-01	15.1379000000000000
1993-01-01	23.3290000000000000
1994-01-01	28.5572000000000000
1995-01-01	30.6319999999999980
1996-01-01	27.0912000000000000
1997-01-01	22.7462000000000000
1998-01-01	24.0975000000000000
1999-01-01	19.7856000000000000
2000-01-01	15.2233000000000000
2001-01-01	11.9025000000000000
2002-01-01	9.0698400000000000
2003-01-01	5.4118900000000005
2004-01-01	3.1448700000000000
2005-01-01	3.5209000000000000
2006-01-01	7.2785600000000010
2007-01-01	8.2599400000000000
2008-01-01	8.5681100000000000
2009-01-01	10.7268000000000000
2010-01-01	9.0866000000000000
2011-01-01	7.5302500000000000
2012-01-01	9.5539100000000000
2013-01-01	10.0378000000000000
2014-01-01	8.9662700000000000
2015-01-01	8.9662700000000000
2016-01-01	7.9509000000000000