1932

7.4

1996

6.5

1956

7.9

1967

7.7

1965

7.5

1973

6.9

1957

8.3

1966

7.2

1999

6.8

1962

7.3

1968

7.8

1999

5.7

1957

7.8

2004

7.2

1988

7.2

1993

5.5

1968

7.6

1974

6.0

2005

6.7

2017

5.8