2000

5.2

2003

5.3

2013

6.5

1976

6.0

2008

5.4

2000

6.8

2009

6.5

1996

6.6

1989

5.1

2006

6.3

1985

7.4

1968

6.5

2004

7.0

1962

7.5

2007

4.9

2008

6.7

2008

5.2

2001

5.2

2012

6.8

2005

6.8