1975

6.7

2005

6.8

2008

6.9

1967

7.8

2007

6.7

2008

6.6

1966

7.6

1955

7.1

2004

4.9

2003

7.0

1995

5.7

2004

7.2

1967

7.3

2007

5.4

2006

5.6

2008

6.2

2006

6.5

1980

6.9

1993

5.7

2006

6.7