1997

6.8

2005

6.7

1967

6.7

1972

3.7

2003

6.4

1990

6.7

2007

7.6

2006

6.7

2000

7.2

2007

6.3

1976

3.3

2005

6.0

1992

0.0

1995

6.8

1988

5.6

2004

6.3

1970

7.1

1974

7.9

2005

6.2

2023

7.7