2008

6.1

2005

7.8

2011

7.1

1979

6.7

2015

6.5

2010

8.2

1972

7.9

2000

5.5

1975

7.5

2011

5.6

2014

8.5

2011

6.9

1959

8.1

1945

7.0

2007

5.3

1968

8.1

2013

6.4

1980

7.3

1982

6.7

2004

5.5