Year	Percent
1980-01-01	5.3076099999999995
1981-01-01	4.9068300000000000
1982-01-01	5.2335600000000000
1983-01-01	6.0861400000000000
1984-01-01	5.2105100000000000
1985-01-01	4.9127100000000000
1986-01-01	5.3036500000000000
1987-01-01	4.3245100000000000
1988-01-01	5.1641500000000000
1989-01-01	5.0824600000000000
1990-01-01	5.7925200000000000
1991-01-01	8.2748300000000000
1992-01-01	9.9973600000000000
1993-01-01	11.9448000000000000
1994-01-01	12.6468000000000000
1995-01-01	12.7993000000000000
1996-01-01	12.0546000000000000
1997-01-01	10.3756000000000000
1998-01-01	9.9755500000000000
1999-01-01	9.3606900000000000
2000-01-01	9.4818500000000000
2001-01-01	11.3235000000000000
2002-01-01	11.3351000000000000
2003-01-01	11.1356000000000000
2004-01-01	10.4024000000000000
2005-01-01	10.6392000000000000
2006-01-01	11.7031000000000000
2007-01-01	10.3771000000000000
2008-01-01	17.2126000000000000