1981

6.2

1985

6.7

1987

7.0

1983

7.8

1977

5.5

1975

6.4

1978

4.1

1993

5.8

1981

5.0

1992

6.8

1976

6.7

1977

6.8

1989

6.7

1971

8.1

1972

5.0

2001

7.2

1981

5.6

1981

6.6

1974

7.6

1985

4.8

2013

5.2

1972

2.0

1984

7.1

1971

0.0

1999

4.5

1973

4.5

1967

6.8

1986

7.2

1976

5.5

1982

7.5

1979

6.7

1998

4.9

1974

7.9

1976

0.0

1982

6.2

1997

6.5

1984

7.5

1984

7.3

1974

7.5

1973

5.9

1973

6.9

1974

6.2

1992

6.0

1975

5.9

1987

5.2

1975

3.0

1981

6.7

1974

0.0

1975

7.3

1978

5.6

1980

0.0

1965

5.4

1971

2.7

1977

7.3

1976

6.7

1970

7.8

1979

5.0

1974

6.8

1979

6.5

1979

3.2

1978

7.0

1993

7.0