1969

7.1

1990

6.0

1981

7.2

1976

5.0

1988

6.7

1996

7.0

1982

7.3

1983

7.3

1984

6.0

1974

5.3

1991

7.2

1972

6.8

1992

6.3

1979

7.3

1971

5.8

1977

6.8

1988

5.3

1974

5.8

1977

5.6

2008

7.3

1971

6.0

1984

6.5

1970

6.7

1981

5.7

1974

5.9

1973

6.3

1993

7.4

1974

6.5

1975

6.9

1972

6.7

1989

6.9

1972

5.6

1978

7.4

1972

6.2

1973

6.5

1977

6.5

1975

6.0

1976

6.4

1974

6.3

1972

6.9

1980

5.3

1970

6.8

1973

3.0

1970

6.2

1971

6.9

1973

6.4

1972

6.7

1976

6.7

1977

5.9

1978

5.7

1968

0.0

1979

6.0

1974

0.0

1972

5.7

1973

6.7

1971

6.6

1971

6.8

1967

5.8

1972

6.1

1976

4.1

1986

4.0

1978

6.4

1975

6.7

1976

6.5

1978

6.1

1980

4.0

1977

6.9

1973

5.5

1973

5.2

1985

7.0

1971

0.0

1972

5.4

1978

5.7

1969

6.6

1991

0.0

1973

6.3

1974

5.0

1973

5.6

1977

6.6

1970

6.3