1965

6.8

2012

6.6

1988

7.7

1967

7.3

2014

5.9

2010

6.0

1987

6.3

1981

6.6

1955

7.9

2013

7.2

2009

6.6

2004

6.6

1994

7.2

1996

7.0

1995

6.0

2003

7.4

1984

6.5

1997

6.6

2013

6.2