2006

6.8

1982

6.3

1976

5.7

1968

3.5

1968

3.5

1980

4.0

1977

5.2

2004

5.0

1982

6.5

2020

0.0

1973

0.0

2004

5.3

2016

5.6

1989

6.7

1982

2.5

1997

4.2

1983

6.6

1973

3.7

1973

5.3

1996

7.0