1969

3.7

1979

6.0

1980

3.1

1991

4.7

1975

6.0

1975

4.3

1972

5.0

1981

1.3

1978

6.3

1998

5.6

1997

5.7

1974

4.1

1976

4.8

1977

4.7

1985

3.5

1937

7.2

2016

0.0

1973

4.4

2009

10.0

1966

6.0