1967

7.5

1991

5.7

1932

6.1

1957

6.9

1971

7.7

2009

6.7

1963

7.3

1939

6.5

1956

6.7

2003

7.4

1996

6.4

2007

5.3

2005

6.7

2000

4.9

1986

6.9

1993

7.5

1993

7.3

1998

6.4

1989

6.5

1939

7.0