1975

5.9

1990

6.9

1940

7.4

2001

6.3

1979

7.0

1983

0.0

2008

5.8

1989

6.1

1955

7.2

1969

6.0

1996

5.5

2005

6.7

1989

4.0

1999

4.9

1974

6.7

2003

6.7

1997

6.0

1998

7.1

1984

6.3

2007

6.0