1995

3.7

1985

5.0

1989

4.0

1991

6.6

1998

3.4

1981

6.0

1990

5.4

1996

1.7

1973

0.0

1995

8.0

1979

0.0

1975

3.7

1979

4.9

1976

5.0

1968

2.3

1987

3.5

1983

5.0

1973

4.6