1985

4.9

1989

8.1

1975

3.7

1981

6.4

1963

7.9

1977

7.7

1994

6.8

1990

7.3

1989

4.0

1979

6.0

1969

5.0

1969

4.3

1978

5.2

1995

6.6

1997

6.4

1994

6.0

1962

7.0