1991

6.8

1971

4.5

2014

5.4

2006

7.5

1893

5.6

2004

7.2

1910

2.5

1984

6.9

2002

2.9

2001

7.1

2010

5.7

1995

6.2

1918

6.0

1912

6.2

1959

5.7

1965

7.0

1987

6.5

1997

4.7

1980

6.2

2009

6.7