1977

6.7

1981

8.2

1976

6.0

1986

7.0

1980

7.7

2020

2.0

1989

0.0

2002

7.0

2012

5.0

1978

5.8

2002

5.3

2002

5.5

1987

4.3

1993

5.1

1973

0.0

1989

7.2