Year	Percent
1980-01-01	5.0308300000000000
1981-01-01	6.3326400000000005
1982-01-01	7.5147400000000000
1983-01-01	11.1723000000000000
1984-01-01	12.5898000000000000
1985-01-01	13.0432000000000000
1986-01-01	11.7367000000000000
1987-01-01	12.4123000000000000
1988-01-01	13.4694000000000000
1989-01-01	11.7297000000000000
1990-01-01	9.6053199999999990
1991-01-01	11.6610000000000000
1992-01-01	11.2116000000000000
1993-01-01	7.5583600000000000
1994-01-01	12.5439000000000000
1995-01-01	9.6022600000000010
1996-01-01	7.8433800000000010
1997-01-01	6.0902100000000000
1998-01-01	5.9982900000000000
1999-01-01	5.2654200000000000
2000-01-01	11.1114000000000000
2001-01-01	12.6331000000000000
2002-01-01	13.1478000000000000
2003-01-01	12.3339000000000000
2004-01-01	10.2653000000000000
2005-01-01	9.8741899999999990
2006-01-01	8.4322300000000000
2007-01-01	8.0749000000000000
2008-01-01	8.3176000000000000
2009-01-01	11.4808000000000000
2010-01-01	9.4227500000000000
2011-01-01	9.8618000000000000
2012-01-01	10.0015000000000000
2013-01-01	8.9333600000000000
2014-01-01	10.0427000000000000
2015-01-01	10.1097000000000000
2016-01-01	9.7546300000000000