2004

6.9

2003

7.2

1965

6.3

1980

6.8

1974

7.2

1990

6.5

1970

7.5

2000

6.4

1999

5.3

1958

7.6

1955

6.6

1988

6.8

1968

6.2

1942

0.0

1994

7.2

1960

7.5

1943

7.7

1939

7.6

1956

0.0

1998

6.1