1981

7.3

2024

6.0

2000

6.8

1968

5.6

1970

4.1

2003

6.3

1988

8.1

1969

6.4

1943

6.2

1957

6.8

1967

6.5

1974

6.2

1964

6.1

1958

6.6

1970

5.8

1965

6.7

1932

6.0

1960

6.1

2005

5.8

2018

6.6