1969

7.1

2015

5.9

1955

7.4

2008

5.5

2006

6.6

1975

8.7

1970

10.0

2012

7.3

2011

5.7

2010

0.0

2009

8.3

1944

5.0

2010

4.0

2011

6.0

2009

7.9

2009

8.1

2004

6.7

2000

6.1

2007

5.7

2017

7.0