1970

7.1

1967

6.9

1975

7.1

2006

6.8

1962

7.0

1952

6.8

2017

7.4

2023

6.3

2017

6.2

1980

3.1

1961

4.9

1990

8.5

1939

7.9

2019

6.5

2023

5.7

2000

6.6

2006

7.8

1964

6.5

1981

7.5

2014

6.9