Year	Percent
1986-01-01	5.8545000000000000
1987-01-01	6.0050000000000000
1988-01-01	4.9300000000000000
1989-01-01	4.4295000000000000
1990-01-01	3.5800000000000000
1991-01-01	4.0650000000000000
1992-01-01	4.9350000000000000
1993-01-01	4.1625000000000000
1994-01-01	4.0400000000000000
1995-01-01	3.9200000000000000
1996-01-01	3.4200000000000000
1997-01-01	3.5991699999999995
1998-01-01	4.0558300000000000
1999-01-01	3.1283300000000000
2000-01-01	3.3200000000000000
2001-01-01	4.6200000000000000
2002-01-01	5.3600000000000000
2003-01-01	7.3900000000000000
2004-01-01	6.5500000000000000
2005-01-01	5.6200000000000000
2006-01-01	3.0800000000000000
2007-01-01	3.6700000000000000
2008-01-01	4.9577400000000000
2009-01-01	4.8700000000000000
2010-01-01	4.4200000000000000
2011-01-01	4.6600000000000000
2012-01-01	4.5600000000000000
2013-01-01	4.6150000000000000
2014-01-01	4.9300000000000000
2015-01-01	5.3900000000000000
2016-01-01	5.4600000000000000