2012

6.3

1971

7.4

2007

6.2

1966

7.2

2010

6.4

2011

5.7

2009

6.0

1961

7.0

2000

6.6

2010

5.8

1996

9.4

1984

6.1

2007

6.5

2008

5.5

1972

7.6

1949

6.5

2006

5.6

1999

7.6

2005

6.1

2008

7.8