1927

8.1

1979

8.3

1982

7.9

2006

6.1

1959

7.8

1930

7.7

2000

7.4

1964

6.0

2017

5.8

2020

6.2

2020

4.5

1966

7.2

1999

6.8

1962

7.3

1968

7.8

1999

5.7

2001

7.5

1957

7.8

2004

7.2

1988

7.2