1974

6.5

1985

8.0

2004

6.9

2005

6.1

2007

6.8

1959

6.9

2000

6.4

1963

0.0

1984

5.9

1954

4.6

1950

5.9

1956

5.1

1963

5.7

1988

4.9

1991

5.5

1957

6.2

1996

0.0

1984

6.3

1977

6.0

2000

4.7