1967

6.9

1960

5.6

1970

4.7

2004

5.8

2005

5.2

1916

6.6

1916

6.2

1969

6.4

1991

6.8

1955

2.4

1917

5.5

1922

6.1

2009

7.2

1995

6.2

1911

3.1

1912

5.2

1916

6.7

2011

5.7

1893

5.5

2007

3.5