1990

6.2

1997

7.5

1967

7.6

1987

6.9

1993

6.5

2006

7.0

2017

8.3

1976

4.5

1965

8.5

2004

7.4

2017

6.4

1975

5.8

1967

7.3

2008

0.0

1969

6.7

2007

7.4

1958

6.6

1982

6.6

1924

8.1

1983

5.9