1985

5.1

1989

8.2

1975

3.7

1981

6.7

1963

7.9

1977

7.7

1994

6.8

1990

7.3

1989

4.0

1979

6.0

1978

6.2

1969

5.5

1986

5.0

1990

6.0

1995

6.6

1997

6.8

1994

6.0

1962

7.0