1976

6.3

1975

4.8

1986

5.6

1982

6.7

1988

5.5

1982

6.4

1974

6.1

1982

6.1

1984

7.0

1970

6.7

1982

5.6

1976

6.7

1979

6.2

1983

5.0

1972

5.5

1973

4.2

1981

3.5

1973

4.4

1978

6.9

1995

5.6

1976

5.0

2005

7.2

1976

6.1

1968

5.2

1980

6.5

1974

4.4

1977

6.7

1990

7.4

1977

5.6

1972

5.8

1976

7.5

1979

6.4

1970

6.5

1978

5.0

1973

6.2

1970

7.5

1978

6.8

1983

5.1

1972

6.8

1975

6.1

1975

5.6

1981

6.9

1980

6.1