2012

6.6

1971

7.7

2001

6.6

2010

6.0

1990

7.5

1992

6.2

1960

8.1

2009

7.0

2009

6.5

2006

5.0

1991

7.0

2013

7.9

1982

6.8

1970

6.9

1999

7.5

1993

7.0

1988

6.3

1955

7.9

1959

7.8