2000

6.8

1977

5.8

2003

5.9

1967

4.9

1979

5.6

1980

5.0

1976

5.8

1977

9.0

1991

3.6

1983

3.0

1981

6.2

2004

7.7

1980

4.2

1986

3.7

1976

3.4

1969

7.8