1974

6.5

1993

6.5

2014

7.0

2008

6.9

2003

6.3

1999

5.9

1929

7.5

1988

6.5

2003

6.8

2013

6.1

2016

6.1

2013

5.7

2016

6.7

1921

6.6

1996

6.5

1989

6.0

2005

5.2

1993

6.6

1998

6.1

2007

7.2