1956

5.8

1978

4.2

1986

6.1

1970

7.5

1985

4.1

1992

7.1

1980

5.8

1978

7.0

1965

7.8

1992

1.2

1975

7.1

1976

3.2

1979

0.0

1984

6.7

1991

7.8

1980

5.5

1988

4.5

1965

0.0

1973

5.6

1975

7.7

1964

4.5

1990

7.3

1968

3.0

1994

6.0