2003

7.8

2001

6.0

2006

5.6

1975

6.9

1939

7.2

1938

7.0

2005

7.5

1958

6.4

1996

6.2

1995

7.0

2000

6.1

1969

6.6

2004

7.2

1993

6.7

1942

6.6

1948

7.8

1942

7.3

1931

7.1

2000

6.6

1963

7.4