1996

7.8

1995

7.0

1955

6.0

2006

5.4

1997

6.8

2002

6.4

1996

5.4

1997

6.7

1963

8.4

2005

6.9

2003

5.8

2006

8.2

2004

7.2

1983

5.8

2008

6.6

1994

6.5

1985

0.0

1960

7.6

1997

6.5

1971

7.1