1971

6.2

1971

6.1

1970

6.3

1968

5.4

1972

6.3

1975

5.1

1982

6.8

2000

6.8

1946

7.6

1941

7.7

2003

7.7

1996

7.7

2002

6.9

2001

6.3

1976

7.2

1934

5.5

1931

6.0

1932

6.0

2006

6.8

1946

6.0