Year	Percent
1980-01-01	5.249780000000000
1981-01-01	5.916600000000000
1982-01-01	6.302300000000000
1983-01-01	8.259920000000000
1984-01-01	8.418370000000000
1985-01-01	9.549270000000000
1986-01-01	9.562840000000000
1987-01-01	9.691360000000001
1988-01-01	10.205400000000000
1989-01-01	11.116500000000000
1990-01-01	13.135200000000000
1991-01-01	11.802600000000000
1992-01-01	11.315800000000000
1993-01-01	10.589700000000000
1994-01-01	10.247100000000000
1995-01-01	8.881160000000001
1996-01-01	7.888470000000000
1997-01-01	6.826400000000000
1998-01-01	7.621180000000001
1999-01-01	10.087000000000000
2000-01-01	9.432330000000000
2001-01-01	12.182100000000000
2002-01-01	14.745800000000000
2003-01-01	15.976900000000000
2004-01-01	9.898120000000000
2005-01-01	9.888490000000000
2006-01-01	11.079600000000000
2007-01-01	11.283400000000000
2008-01-01	5.950610000000000