1997

6.3

1980

6.8

1970

6.8

1979

5.6

2016

5.8

1956

5.4

2019

7.2

1957

6.4

1946

6.5

1965

6.7

1989

5.7

2018

7.0

1943

7.2

2004

6.7

1945

6.7

1982

5.5

2004

5.9

1990

6.9

1992

7.0

2008

6.8