1956

6.2

1994

6.5

1943

0.0

1961

7.7

1976

6.5

1971

7.2

1999

7.2

2006

7.5

2006

7.1

2007

6.9

1937

0.0

2002

5.9

1999

6.8

2005

7.1

1997

7.8

2000

6.5

2002

6.6

1969

6.3

1932

7.4

1995

7.0