2012

6.2

1987

3.7

1983

4.0

1978

6.2

1976

7.1

1988

5.2

1976

4.7

1977

5.8

1989

5.1

1984

6.0

1971

5.3

1985

0.0

1980

6.5

1974

4.8

1973

5.9

1983

0.0

1968

7.8

1985

5.5

1975

5.2

1971

4.4

1963

7.2

1974

5.5

1974

0.0

1975

4.3