1990

4.7

1979

2.0

1992

4.5

1977

6.8

1981

4.4

1986

4.6

1985

5.3

1996

5.6

1993

7.0

1973

3.5

1982

7.5

1975

4.1

1992

4.8

1978

0.0

1973

6.0

1974

4.5

1976

5.6