2006

6.5

1978

6.3

1975

6.8

1992

7.0

1980

7.3

2005

5.9

2006

6.7

1972

6.5

2002

6.3

1995

6.3

1979

6.8

1985

6.2

1991

6.6

1962

6.7

1998

6.9

1985

5.4

1930

3.5

2005

5.8

1998

6.3

1986

4.7