1937

0.0

1960

6.6

1963

6.8

2005

6.9

2011

7.8

1924

8.1

1990

7.4

1992

6.8

1994

7.0

1970

7.5

2003

6.4

1995

6.3

2003

6.3

2006

5.9

1972

6.3

1929

6.4

1994

5.3

1969

6.5

1921

8.2

1976

6.5