1954

7.9

1971

6.4

1977

6.8

1994

8.3

1932

7.8

2004

7.4

1986

7.6

2004

7.2

1999

7.0

2006

6.0

2008

6.6

2001

6.5

2002

7.0

1924

7.4

2002

6.3

2004

4.8

1995

6.5

2007

5.7

1991

7.6

1987

7.1