1967

6.5

2009

5.0

2006

7.4

2000

7.0

1966

7.2

1962

7.3

2001

7.8

1999

5.7

1988

7.5

2005

7.0

2000

7.3

2002

6.2

1997

6.2

1942

7.5

1995

6.6

1967

7.0

1991

7.7

1979

7.7

1961

7.3

1963

7.0