1971

7.4

2011

4.4

1967

6.5

2007

6.3

1977

7.5

1998

6.0

1999

5.8

1965

6.1

1977

5.6

1998

6.7

1980

5.6

1981

0.0

1987

6.7

1962

7.3

2006

6.7