1980

5.5

2009

6.5

2012

7.0

1968

6.0

2013

4.4

1983

7.6

1968

6.3

2008

6.5

1981

7.0

2008

6.2

2002

7.0

1978

6.8

1970

5.5

2013

7.3

1967

6.2

1936

6.1

1966

6.4

1969

6.9

1974

6.7

1952

6.2