1991

6.7

1980

6.3

2005

4.3

1944

6.4

2005

4.9

1970

7.5

1995

6.8

2002

6.2

1942

7.3

2006

5.1

1976

7.2

2008

6.0

1994

6.6

2009

6.4

1967

6.8

1946

6.4

1943

6.9

1999

5.0

2006

5.4

2006

6.5