1996

6.7

2013

5.8

2004

5.8

2012

6.3

2004

6.5

2015

6.3

2012

6.3

2010

6.1

1895

5.4

2003

6.2

2013

7.8

1997

6.8

1987

7.5

2006

7.0

1953

7.7

2010

6.7

1928

7.3

2008

6.8

2004

6.7