1940

6.1

2004

5.9

2009

8.1

2009

7.2

1998

0.0

1979

6.7

2004

6.6

1960

7.8

1988

6.3

1972

0.0

1943

7.1

1997

6.0

1963

6.7

1965

0.0

1988

6.9

1993

6.2

1972

7.3

1970

6.4

1979

7.5

2007

6.8