1984

6.8

1989

8.1

1986

8.5

1982

1.0

1989

3.0

1981

6.6

1997

7.4

1978

8.0

1979

5.5

1980

7.4

1986

7.3

1974

6.0

1988

6.3

1965

0.0

1978

0.0

2003

7.4

1984

6.7

1975

6.7

2007

6.7

1974

5.3