2007

6.9

1993

4.9

1987

6.2

2011

5.2

1956

7.7

2007

7.6

2009

6.6

2008

6.8

1946

7.6

1994

4.8

1966

7.2

2005

6.8

1966

8.0

2009

5.6

1989

7.0

2001

5.2

2012

5.1

2002

6.3

2005

6.8

1995

6.3