2009

6.8

2013

6.0

2010

6.6

2002

4.6

2010

5.9

2014

6.5

1968

6.8

2016

7.0

1973

8.0

1961

7.0

2018

7.4

2013

6.1

1933

7.2

2013

8.1

2008

6.7

1990

7.9

1996

6.8

2006

6.9

2006

6.1

1990

6.1