Year	Percent
1977-01-01	1.2012700000000000
1978-01-01	6.8559100000000010
1979-01-01	9.0778300000000000
1980-01-01	5.9215700000000000
1981-01-01	2.8096000000000000
1982-01-01	2.5198000000000000
1983-01-01	2.1973700000000003
1984-01-01	1.8362500000000000
1985-01-01	2.1312500000000000
1986-01-01	2.4298100000000000
1987-01-01	2.9411200000000000
1988-01-01	3.4036000000000000
1989-01-01	4.3639800000000010
1990-01-01	3.1278900000000003
1991-01-01	2.6960800000000000
1992-01-01	4.1498300000000010
1993-01-01	2.5701000000000000
1994-01-01	5.2855099999999995
1995-01-01	2.9745400000000000
1996-01-01	2.2698300000000000
1997-01-01	1.6407900000000002
1998-01-01	1.4472900000000000
1999-01-01	1.2473299999999998
2000-01-01	0.9313930000000000
2001-01-01	0.8056939999999999
2002-01-01	0.6255140000000000
2003-01-01	4.0727199999999995
2004-01-01	3.4081500000000000
2005-01-01	2.8518000000000000
2006-01-01	2.3850400000000000
2007-01-01	2.5502800000000000
2008-01-01	2.5199000000000000
2009-01-01	2.5028099999999998
2010-01-01	2.7432300000000000