1981

6.7

2003

6.5

1995

3.0

1985

4.1

2011

7.5

1992

7.1

1978

5.0

1990

10.0

1994

8.3

1970

6.3

1987

5.2

1978

8.0

1977

6.3

1980

0.0

1990

7.0

1997

6.7

1980

5.5