2006

6.0

2005

6.5

1976

6.6

1925

6.9

1988

7.4

2008

4.0

2008

6.1

1994

8.3

2006

6.7

1999

6.6

1997

5.7

1992

6.6

1991

6.1

2001

6.8

1978

6.3

2003

5.7

1986

6.4

1995

6.9

1997

7.5

1998

6.8