1996

6.1

1998

7.2

1989

7.2

1978

6.7

1987

6.4

1990

7.3

1980

6.3

1975

7.5

1956

6.7

1950

7.7

2017

3.6

2014

3.0

2019

10.0

1973

5.9

1947

6.7

1962

7.2

1957

7.2

1990

5.0

1961

6.5

1931

0.0