Year	Percent
1982-01-01	3.8916699999999995
1983-01-01	4.5175000000000000
1984-01-01	4.0541700000000000
1985-01-01	4.0450000000000000
1986-01-01	5.7958300000000005
1987-01-01	15.3608000000000000
1988-01-01	22.4983000000000000
1989-01-01	22.3242000000000000
1990-01-01	23.0850000000000000
1991-01-01	21.2467000000000000
1992-01-01	23.1208000000000000
1993-01-01	12.9683000000000000
1994-01-01	9.0833300000000000
1995-01-01	8.3908300000000010
1996-01-01	9.6666700000000000
1997-01-01	6.9208300000000005
1998-01-01	6.9208300000000005
1999-01-01	6.9816699999999990
2000-01-01	6.9408300000000000
2001-01-01	6.3358300000000005
2002-01-01	5.5483300000000000
2003-01-01	4.7383300000000000
2004-01-01	3.4350000000000000
2005-01-01	2.4908300000000000
2006-01-01	2.2766700000000000
2007-01-01	2.2816700000000000
2008-01-01	2.2600000000000000
2009-01-01	2.2508300000000000
2010-01-01	2.1391700000000000
2011-01-01	1.6433300000000000
2012-01-01	1.4766700000000001
2013-01-01	1.5200000000000000
2014-01-01	1.3608300000000000
2015-01-01	1.1133300000000000
2016-01-01	2.4225000000000000