2014

4.5

2009

3.8

2010

6.1

1999

1.4

2006

6.5

2004

5.4

1986

3.0

2016

1.0

2007

6.5

2005

7.2

2001

1.3

2014

5.8

2016

5.2

0.0

1936

3.6

2016

5.0

2016

5.0

2014

6.3

1979

5.3

1970

3.5