2006

5.9

1996

6.3

1989

5.3

2006

7.1

2007

6.9

1974

7.0

1997

4.6

1955

6.0

1983

6.7

2008

6.7

1977

5.6

2000

6.5

2005

6.5

1998

6.8

2013

6.6

1998

5.6

1994

4.4

1980

5.3

2006

5.8

1998

3.8