2009

4.7

2011

9.1

2014

7.5

2012

9.7

1972

5.9

1992

6.8

2006

6.5

1957

6.2

1972

7.3

1993

6.6

2001

6.8

1948

7.0

1998

7.0

1934

6.9

1975

6.4

2010

5.5

1984

7.2

1987

6.5

2013

7.0

1958

6.6