Year	Percent
1983-01-01	4.7298100000000000
1984-01-01	5.0630600000000000
1985-01-01	5.8550100000000000
1986-01-01	6.2070000000000010
1987-01-01	7.0225300000000010
1988-01-01	7.0014800000000000
1989-01-01	6.2026600000000000
1990-01-01	4.1183800000000000
1991-01-01	6.4499800000000000
1992-01-01	7.0662100000000010
1993-01-01	8.3123300000000010
1994-01-01	8.0069800000000000
1995-01-01	5.4480600000000000
1996-01-01	4.9169800000000010
1997-01-01	5.8114300000000005
1998-01-01	10.4479000000000000
1999-01-01	10.4559000000000000
2000-01-01	8.6911300000000010
2001-01-01	8.0076000000000000
2002-01-01	7.5878399999999990
2003-01-01	7.4779500000000000
2004-01-01	6.4125600000000000
2005-01-01	5.9976600000000000
2006-01-01	5.3489000000000000
2007-01-01	11.8722000000000000
2008-01-01	7.4167399999999990
2009-01-01	11.6498000000000000
2010-01-01	11.8097000000000000
2011-01-01	11.1009999999999990
2012-01-01	9.2599500000000000
2013-01-01	8.7417800000000000
2014-01-01	10.2156000000000000
2015-01-01	10.3511000000000000
2016-01-01	13.3685000000000000