2013

3.6

2013

2.5

2007

6.2

2016

3.0

2001

5.6

1971

7.0

2010

3.9

2005

5.4

2007

6.1

1975

6.0

1999

6.8

1942

4.8

1981

3.2

1983

5.7

2009

6.0

2016

6.5

1983

6.5

1977

6.1

2008

6.2

2015

7.5