1976

5.7

1955

7.2

2001

6.3

2005

6.9

1986

6.0

1954

6.5

2007

6.1

2000

6.7

2003

5.5

1957

7.0

2002

5.5

2002

7.2

2005

6.3

1990

7.3

1991

6.9

2009

7.2

2002

6.4

2008

5.7

1997

7.6

1963

6.6