Year	Percent
1982-01-01	9.5316300000000000
1983-01-01	6.4883200000000000
1984-01-01	6.2469700000000000
1985-01-01	7.0616100000000010
1986-01-01	6.7591800000000010
1987-01-01	6.4683400000000000
1988-01-01	5.3919900000000000
1989-01-01	5.0659800000000010
1990-01-01	5.1840800000000010
1991-01-01	4.7962200000000000
1992-01-01	7.1831700000000000
1993-01-01	6.4033100000000000
1994-01-01	8.2637200000000000
1995-01-01	2.6201400000000000
1996-01-01	14.5080000000000000
1997-01-01	6.0686100000000000
1998-01-01	2.9661299999999997
1999-01-01	3.5897000000000000
2000-01-01	4.9654400000000000
2001-01-01	7.1455899999999990
2002-01-01	1.5601900000000000
2003-01-01	1.2705400000000000
2004-01-01	1.3507000000000000
2005-01-01	1.2906600000000001
2006-01-01	1.1356400000000000
2007-01-01	1.0529800000000000
2008-01-01	1.4650100000000001
2009-01-01	1.8837400000000002
2010-01-01	1.6793000000000000
2011-01-01	2.7477000000000000
2012-01-01	2.8190400000000000
2013-01-01	2.9571600000000000
2014-01-01	3.4511500000000000
2015-01-01	3.2623599999999997
2016-01-01	2.3940200000000003
2017-01-01	2.2460000000000000