Year	Percent
1980-01-01	10.5279000000000000
1981-01-01	12.2342000000000000
1982-01-01	9.7383600000000000
1983-01-01	8.3897700000000000
1984-01-01	7.5148300000000000
1985-01-01	7.1187200000000000
1986-01-01	7.4870399999999995
1987-01-01	2.7770099999999998
1988-01-01	3.2797500000000000
1989-01-01	3.9456200000000000
1990-01-01	8.5445200000000000
1991-01-01	10.4367000000000000
1992-01-01	10.0608000000000000
1993-01-01	12.0542000000000000
1994-01-01	13.4293000000000000
1995-01-01	14.4570000000000000
1996-01-01	12.5172000000000000
1997-01-01	13.3599000000000000
1998-01-01	12.7359999999999990
1999-01-01	13.2235000000000000
2000-01-01	14.5109000000000000
2001-01-01	14.6453000000000000
2002-01-01	14.1356000000000000
2003-01-01	12.2749000000000000
2004-01-01	8.0043400000000000
2005-01-01	9.1465199999999990
2006-01-01	8.2015800000000000
2007-01-01	7.1947700000000000
2008-01-01	7.2459000000000000
2009-01-01	6.3747800000000000
2010-01-01	7.0894100000000010
2011-01-01	6.1338000000000000
2012-01-01	9.2225700000000000
2013-01-01	9.9793100000000000
2014-01-01	10.0895000000000000
2015-01-01	9.0567400000000000
2016-01-01	8.9684300000000000