2007

7.7

2008

5.4

1984

6.3

2011

8.1

1980

6.7

2001

7.0

2010

6.1

1969

4.7

2003

6.8

2009

5.6

1994

6.6

2017

6.1

1993

5.8

1957

7.2

2001

6.3

1940

6.3

1999

5.1

2010

7.7

1957

8.5

2006

6.0