1991

6.7

1990

6.0

2019

6.8

1987

5.3

2009

5.7

1987

7.1

1968

7.6

1965

6.3

1988

7.6

1941

7.0

2009

7.9

1983

5.4

2008

6.4

1999

6.9

1968

6.5

1940

7.4

1969

8.3

2021

7.8

1949

6.9

2022

7.0