1988

6.3

1990

5.9

1960

7.7

1958

7.6

1988

4.5

1975

6.4

1984

7.2

1956

7.5

1939

7.1

1940

7.0

2001

6.1

1980

7.0

2006

6.5

1949

7.5

1970

6.3

2009

5.0

2017

6.8

1955

7.2

1963

7.3

1997

7.6