2017

6.6

2017

6.2

2011

6.7

2004

7.0

1999

5.7

1998

6.8

2001

7.2

1995

7.3

2006

5.9

2002

6.1

1994

7.3

1976

5.7

1931

6.0

1976

0.0

2012

0.0

2014

4.5

2009

7.4

1992

5.2

2005

6.5

2007

6.4