1961

4.8

1987

6.2

1932

7.4

1996

6.4

1956

7.9

1968

7.2

1973

6.9

1957

8.3

1961

7.7

1976

6.5

1971

7.2

1999

7.2

2006

7.1

2000

7.4

2017

6.6

1902

7.9

1966

7.2

1999

6.8

1962

7.3

1968

7.8