1995

3.5

1985

5.1

1989

3.9

1991

6.6

1998

3.8

1981

6.0

1990

4.8

1996

1.8

1973

0.0

1995

8.0

1979

0.0

1975

3.0

1979

4.9

1976

5.2

1968

2.3

1987

3.6

1983

5.0

1973

4.7