1994

6.5

2012

6.0

1931

6.9

1989

5.1

2008

6.8

2015

5.7

2005

7.4

2013

5.8

1993

6.6

2008

5.9

1979

7.5

1997

7.0

2007

7.1

2012

6.4

1987

7.2

2009

6.2

2013

6.5

1887

5.0

2005

6.6

1999

8.4