Year	Percent
1980-01-01	4.4634900000000000
1981-01-01	2.6920100000000000
1982-01-01	0.9297620000000001
1983-01-01	2.2235600000000000
1984-01-01	2.4267700000000000
1985-01-01	1.0573100000000000
1986-01-01	3.3459199999999996
1987-01-01	9.5496199999999990
1988-01-01	9.8359800000000010
1989-01-01	9.7731800000000000
1990-01-01	9.6258699999999990
1991-01-01	6.9233600000000010
1992-01-01	9.4341800000000000
1993-01-01	11.4925000000000000
1994-01-01	16.3708000000000000
1995-01-01	19.8236000000000000
1996-01-01	24.1902000000000000
1997-01-01	26.3003000000000000
1998-01-01	17.8491000000000000
1999-01-01	18.3049000000000000
2000-01-01	15.2528000000000000
2001-01-01	6.2270199999999996
2002-01-01	3.1582300000000000
2003-01-01	2.6739700000000000
2004-01-01	3.0542100000000000
2005-01-01	4.1768700000000000
2006-01-01	6.1152000000000000
2007-01-01	11.4182000000000000
2008-01-01	11.1745000000000000
2009-01-01	7.6776399999999990
2010-01-01	9.3442000000000000
2011-01-01	11.3569000000000000
2012-01-01	12.7875000000000000
2013-01-01	14.6779999999999990
2014-01-01	14.9934000000000000
2015-01-01	13.5861000000000000
2016-01-01	11.8815000000000000
2017-01-01	10.7732000000000000