1979

0.0

1964

7.9

1974

6.5

1976

6.1

1965

7.9

1977

0.0

1965

7.3

1980

6.0

1974

7.7

1975

4.0

1982

5.1

1976

7.2

1969

6.0

1977

6.4

1984

7.4

1977

0.0

1991

7.7

1966

6.2

1990

6.2

1977

6.3

1962

5.6

1961

5.1

1970

7.8

2003

8.0

2004

9.0