1955

2.4

2004

5.8

2005

5.2

2007

5.9

1949

5.8

2007

6.8

2002

2.7

2014

5.4

2010

5.7

1912

5.2

2013

4.4

1995

6.2

1971

4.5

2009

6.2

1991

6.8

2004

7.1

1918

6.0

2000

5.3

1893

5.5

1904

5.5