2007

6.2

2012

5.0

1980

5.9

2012

6.3

1996

7.6

1965

6.7

2013

7.8

1972

6.6

2006

5.7

1971

7.4

1965

7.4

2013

6.5

2010

6.5

2001

6.0

1992

6.9

1962

7.8

2011

7.2

2013

7.1

1985

6.2