Year	Percent
1983-01-01	53.2833000000000000
1984-01-01	53.2833000000000000
1985-01-01	53.2833000000000000
1986-01-01	41.6750000000000000
1987-01-01	42.0417000000000000
1988-01-01	27.1417000000000000
1989-01-01	17.5333000000000000
1990-01-01	12.0487000000000000
1991-01-01	12.5378000000000000
1992-01-01	8.6483300000000000
1993-01-01	6.0005800000000000
1994-01-01	5.2607500000000000
1995-01-01	6.1060000000000000
1996-01-01	5.9239999999999995
1997-01-01	5.4360000000000000
1998-01-01	5.1140000000000000
1999-01-01	4.8030800000000005
2000-01-01	3.9412000000000000
2001-01-01	3.6494000000000000
2002-01-01	3.7341000000000000
2003-01-01	3.9442100000000000
2004-01-01	3.5961100000000000
2005-01-01	3.8885500000000000
2006-01-01	3.4530400000000000
2007-01-01	3.4179699999999995
2008-01-01	3.4339900000000000
2009-01-01	3.2690799999999998
2010-01-01	3.4000900000000000
2011-01-01	3.4394099999999996
2012-01-01	3.3044599999999997
2013-01-01	3.1108599999999997
2014-01-01	3.0215500000000000
2015-01-01	2.9961900000000004
2016-01-01	2.9597900000000004