Year	Percent
1965-01-01	1.4728100000000000
1966-01-01	1.5357100000000001
1967-01-01	1.9860799999999998
1968-01-01	2.4039500000000000
1969-01-01	2.7637099999999997
1970-01-01	1.5864600000000000
1971-01-01	1.4601700000000000
1972-01-01	1.5996000000000000
1973-01-01	1.7760599999999998
1974-01-01	1.8067600000000000
1975-01-01	1.6444200000000000
1976-01-01	1.7253100000000000
1977-01-01	1.8967900000000002
1978-01-01	2.0925599999999998
1979-01-01	2.5488600000000000
1980-01-01	2.3325299999999998
1981-01-01	2.5405700000000000
1982-01-01	2.6012299999999997
1983-01-01	2.7595900000000000
1984-01-01	2.8927800000000000
1985-01-01	1.9671100000000000
1986-01-01	2.0936400000000000
1987-01-01	3.0333200000000002
1988-01-01	2.0779500000000000
1989-01-01	1.3393000000000000
1990-01-01	1.5231800000000000
1991-01-01	1.5340000000000000
1992-01-01	2.0721500000000000
1993-01-01	1.9415300000000000
1994-01-01	2.0065500000000000
1995-01-01	1.2417600000000000
1996-01-01	0.9046120000000001
1997-01-01	0.9901010000000000
1998-01-01	1.2246000000000000
1999-01-01	1.7149299999999998
2000-01-01	2.2648400000000000
2001-01-01	2.6144200000000000
2002-01-01	2.6331000000000000
2003-01-01	2.6603500000000000
2004-01-01	2.4080000000000000
2005-01-01	2.5502500000000000
2006-01-01	2.3629100000000000
2007-01-01	2.8560500000000000