1939

7.2

1948

8.0

1964

7.2

1974

7.5

1953

7.4

1955

7.9

1969

7.5

1975

8.0

2000

7.3

1981

9.0

2020

6.2

1985

6.0

2020

5.7

1954

7.3

2002

7.0

2002

7.4

1999

5.8

2021

7.1

2022

8.2

2005

5.2