1958

7.6

1984

8.0

1995

7.0

1985

7.0

1998

7.4

1996

6.9

2006

6.8

2002

5.6

0.0

1983

2.0

2006

6.2

1957

8.5

1966

7.7

2004

6.0

1932

0.0

1940

5.2

1999

7.0

2001

7.5

1993

7.4

2006

7.7