1992

6.2

2014

7.2

2009

4.8

2006

5.5

2010

4.4

1988

6.5

2020

6.4

2013

6.9

2005

6.3

2003

5.7

2009

7.3

2020

6.9

1988

6.5

2008

7.0

2009

5.8

1943

8.2

1967

6.8

1989

7.0

2011

7.1

2011

7.2