1952

6.7

2003

5.5

2005

6.8

1941

7.0

2006

5.1

1997

7.9

1978

6.4

2013

6.8

1974

6.4

1995

5.6

2011

6.9

2007

6.7

2012

5.6

1988

6.2

1994

6.5

1953

7.3

1985

8.3

1959

7.8

2004

6.6

1957

6.7