1976

3.9

2012

7.3

1981

2.0

1978

5.7

1977

5.0

1988

5.9

1971

6.0

1975

5.9

1985

4.1

2011

5.2

2021

6.2

1978

5.2

1974

4.8

1961

7.5

1997

4.7

1980

4.7

2010

4.8

1927

5.6

1934

4.7

1933

6.5