1965

5.8

1985

5.1

1978

6.2

2001

7.2

1979

4.3

1977

3.8

1979

4.0

1985

7.3

1978

3.5

1978

1.0

1980

6.6

1966

7.2

1967

4.9

1982

6.1

1962

5.8

2007

8.2

1987

6.4

1981

6.3