Year	Percent
1980-01-01	12.7652000000000000
1981-01-01	12.5306000000000000
1982-01-01	14.9171000000000000
1983-01-01	15.9813000000000000
1984-01-01	13.1915000000000000
1985-01-01	12.2105000000000000
1986-01-01	16.5113000000000000
1987-01-01	14.6510000000000000
1988-01-01	12.3648000000000000
1989-01-01	14.4781000000000000
1990-01-01	10.1946000000000000
1991-01-01	7.8281700000000000
1992-01-01	5.3781000000000000
1993-01-01	4.4147900000000000
1994-01-01	4.0272700000000000
1995-01-01	4.0418900000000000
1996-01-01	4.9985900000000000
1997-01-01	4.1394300000000000
1998-01-01	5.1399700000000000
1999-01-01	11.8349000000000000
2000-01-01	10.3082000000000000
2001-01-01	10.0529000000000000
2002-01-01	10.4369000000000000
2003-01-01	11.7922000000000000
2004-01-01	6.2619300000000000
2005-01-01	4.7447500000000000
2006-01-01	5.2416400000000000
2007-01-01	4.4343800000000000
2008-01-01	3.1100100000000000
2009-01-01	2.2405400000000000
2010-01-01	2.4425700000000000
2011-01-01	3.3659400000000000
2012-01-01	3.6366400000000003
2013-01-01	2.5941799999999997
2014-01-01	2.1754400000000000
2015-01-01	2.7163700000000000
2016-01-01	2.5426900000000003