Year	Percent
1980-01-01	10.1157000000000000
1981-01-01	10.1541000000000000
1982-01-01	12.0727000000000000
1983-01-01	11.5991000000000000
1984-01-01	14.7231000000000000
1985-01-01	15.1256000000000000
1986-01-01	18.6911000000000000
1987-01-01	17.8424000000000000
1988-01-01	16.1309000000000000
1989-01-01	14.0610000000000000
1990-01-01	11.5551000000000000
1991-01-01	10.0065000000000000
1992-01-01	8.2961900000000000
1993-01-01	8.2543400000000000
1994-01-01	6.7638700000000000
1995-01-01	5.8707400000000005
1996-01-01	5.5192300000000000
1997-01-01	4.8625500000000000
1998-01-01	9.8550500000000000
1999-01-01	14.4712000000000000
2000-01-01	15.4002000000000000
2001-01-01	16.2692000000000000
2002-01-01	16.6283000000000000
2003-01-01	16.1399000000000000
2004-01-01	14.6752000000000000
2005-01-01	13.0037000000000000
2006-01-01	11.5774000000000000
2007-01-01	10.5958000000000000
2008-01-01	10.1051000000000000
2009-01-01	12.3943000000000000
2010-01-01	11.9063000000000000
2011-01-01	11.6793000000000000
2012-01-01	12.9177000000000000
2013-01-01	12.4112000000000000
2014-01-01	13.7315000000000000
2015-01-01	14.7133000000000000
2016-01-01	12.9022000000000000