2005

6.7

2001

5.9

1977

6.3

2007

7.8

2007

6.3

2002

7.8

1976

5.6

2007

5.3

1963

7.7

1966

5.2

2006

6.2

1993

6.4

2007

6.2

2002

6.4

2008

5.7

2003

6.1

1980

6.0

1981

6.3

2008

5.4

2002

7.1