1971

5.0

1969

4.5

1971

5.2

1984

6.7

1998

7.3

1957

8.5

1966

7.7

1958

7.7

1984

8.0

1961

5.5

2000

0.0

1996

6.1

2002

7.1

1948

7.9

1976

6.0

1988

7.4

2006

6.7

1987

6.6

2016

7.0

1990

7.0