Year	Percent
1980-01-01	6.400000000000000
1981-01-01	4.633330000000000
1982-01-01	5.658330000000000
1983-01-01	4.508330000000000
1984-01-01	4.383330000000000
1985-01-01	6.441669999999999
1986-01-01	6.399170000000000
1987-01-01	6.544169999999999
1988-01-01	4.841670000000000
1989-01-01	5.175000000000000
1990-01-01	6.175000000000000
1991-01-01	4.225000000000000
1992-01-01	4.275000000000000
1993-01-01	3.935000000000000
1994-01-01	6.425000000000000
1995-01-01	6.475000000000000
1996-01-01	5.900000000000000
1997-01-01	5.075000000000000
1998-01-01	4.825000000000000
1999-01-01	4.700000000000000
2000-01-01	4.925000000000000
2001-01-01	4.900000000000000
2002-01-01	4.700000000000000