1977

7.1

1950

6.3

1980

6.7

1998

7.5

1958

7.5

1987

8.1

1951

7.0

1988

0.0

1989

6.1

1990

6.8

2004

7.1

1956

5.9

2005

8.6

1968

6.5

1942

6.0

1957

5.5

1986

1.5

1931

5.0

1968

0.0

1967

6.0