Year	Percent
1965-01-01	1.5684500000000000
1966-01-01	2.2292099999999997
1967-01-01	2.6313200000000000
1968-01-01	2.4294599999999997
1969-01-01	2.5031500000000000
1970-01-01	1.5480000000000000
1971-01-01	1.5759900000000000
1972-01-01	1.6553000000000000
1973-01-01	2.0436099999999997
1974-01-01	2.3003200000000000
1975-01-01	3.0380000000000003
1976-01-01	3.7061000000000000
1977-01-01	3.4767900000000003
1978-01-01	4.1804400000000000
1979-01-01	5.4287600000000000
1980-01-01	7.0639800000000000
1981-01-01	7.9941699999999996
1982-01-01	7.7760100000000000
1983-01-01	6.8968800000000000
1984-01-01	7.6067800000000005
1985-01-01	8.1774800000000010
1986-01-01	8.1888899999999990
1987-01-01	8.6322300000000000
1988-01-01	9.7844100000000010
1989-01-01	10.2527000000000000
1990-01-01	10.5015000000000000
1991-01-01	12.1798000000000000
1992-01-01	10.1302000000000000
1993-01-01	4.9996000000000000
1994-01-01	2.9860500000000000
1995-01-01	2.6403900000000000
1996-01-01	2.6505799999999997
1997-01-01	3.4188699999999996
1998-01-01	4.5146500000000000
1999-01-01	5.5668100000000000
2000-01-01	5.7608600000000000
2001-01-01	4.7121800000000000
2002-01-01	3.6117600000000000
2003-01-01	3.1695100000000000
2004-01-01	2.8017100000000000
2005-01-01	3.3561099999999997
2006-01-01	3.4576700000000000