1970

6.4

1991

3.4

1975

7.2

1992

8.5

1980

0.0

1966

6.4

1968

7.1

1984

0.0

1981

7.6

1979

4.7

1987

6.0

1994

5.4

1980

7.3

1990

4.0

2006

7.7

1973

7.1

1982

7.4

1983

7.5

1974

6.5

1969

2.6

1995

4.0

1978

7.0

1982

7.5

1977

5.0