1974

5.8

1973

5.7

1966

6.5

1967

6.5

1966

7.9

1969

5.3

1972

2.5

1964

7.4

1955

7.3

2003

6.1

1986

6.3

1997

6.2

1975

6.8

1960

5.9

1972

10.0

1988

6.6

1984

6.8

1987

5.6

1957

6.3

1989

6.3