1999

7.4

1957

7.8

2006

7.8

2005

5.8

2006

6.2

1977

6.3

1972

6.6

2005

7.1

1968

8.0

1975

6.4

1959

7.7

1998

7.0

1958

5.9

1982

6.9

1988

7.4

1969

0.0

1976

7.8

1987

7.2

2001

7.0

2008

6.9