1949

7.5

2015

7.4

2017

4.7

1981

6.9

1921

6.8

1961

6.7

2023

6.1

2014

5.6

1969

5.1

1987

8.0

1927

7.8

2013

6.1

1993

7.8

2008

7.8

1976

7.6

1956

6.9

1924

7.5

1973

6.5

1933

5.5

1987

7.1