1976

7.6

1984

6.4

2008

0.0

1994

7.8

1981

5.5

1993

7.7

1974

8.0

1992

7.4

1982

4.0

1988

5.3

1979

6.7

1980

4.0

1993

7.1

1977

7.3

1975

7.3

1985

6.0

1979

5.0

2000

7.1

1978

7.2

1981

6.6

1979

6.1

2006

4.9

1999

8.3