2009

6.8

1975

6.0

1995

4.2

2005

7.1

2007

5.7

2009

5.8

2001

5.3

2006

5.5

1974

7.7

2016

5.8

1978

6.3

2014

6.0

1955

7.3

1955

6.8

1960

6.7

2017

6.4

2017

4.1

2017

5.9

2016

0.0

1999

7.5