1966

5.8

1969

6.6

1972

6.3

1991

5.3

1985

5.8

1967

6.9

1963

7.5

1943

5.4

1982

4.5

1982

7.2

1977

5.5

2016

6.4

1987

7.0

1997

7.5

1952

6.0

1967

6.0

1905

4.3

1937

3.2