1921

3.3

1969

4.4

1933

5.4

1972

7.0

1918

6.7

1915

6.2

1960

6.1

2021

5.0

1975

5.5

1967

3.6

1968

3.6

1978

6.0

1976

2.5

1920

4.9

1973

5.8

1987

5.0

1973

4.0

1970

4.2

1984

8.0

2006

6.8