1970

7.1

1967

6.9

1975

7.1

1973

7.5

1962

7.0

1952

6.8

2023

6.3

2017

6.2

1980

3.1

2014

7.1

1961

4.9

1990

8.5

1939

7.9

2019

6.5

2023

5.7

1958

6.4

2000

6.6

1981

7.5

2014

6.9

2020

6.7