Year	Percent
1988-01-01	3.4625800000000004
1989-01-01	3.1475200000000000
1990-01-01	1.6365299999999998
1991-01-01	0.5274060000000000
1992-01-01	0.3698610000000000
1993-01-01	0.3258430000000000
1994-01-01	1.2609500000000000
1995-01-01	1.9238900000000000
1996-01-01	1.6191700000000000
1997-01-01	1.2509000000000000
1998-01-01	1.3108600000000001
1999-01-01	1.3902100000000000
2000-01-01	1.4966600000000000
2001-01-01	1.4459400000000000
2002-01-01	1.1295600000000001
2003-01-01	0.9291080000000000
2004-01-01	0.8881899999999999
2005-01-01	1.0383700000000000
2006-01-01	4.3882000000000000
2007-01-01	7.6171899999999990
2008-01-01	7.6083600000000000
2009-01-01	10.2079000000000000
2010-01-01	11.3717000000000000
2011-01-01	9.8708600000000000
2012-01-01	8.7875100000000010
2013-01-01	7.8634900000000000
2014-01-01	6.8176900000000000
2015-01-01	6.2129900000000005
2016-01-01	6.1075000000000000