1978

6.7

1983

3.6

1982

8.0

1971

5.7

2011

7.0

1978

7.5

1975

5.8

1989

5.6

1981

4.3

1973

6.4

2007

4.0

1980

5.5

1978

7.5

1971

3.7

1973

0.0

1997

4.9