1998

7.0

1987

6.8

1986

5.8

1967

7.0

1970

6.7

1997

7.1

1931

7.3

1947

6.5

1973

6.2

1937

7.2

1932

6.9

1932

7.4

1995

7.9

1926

7.9

1941

7.7

1971

7.4

1929

6.5

1950

8.1

1995

8.2

2002

5.3