2005

6.4

1970

7.2

2004

5.9

2005

7.7

1993

6.2

1965

8.1

1998

6.7

2007

7.2

1998

7.5

2003

6.8

1957

7.8

1962

7.0

2004

7.3

1989

6.0

2005

6.8

2002

7.1

1978

6.4

1959

4.0

2006

6.9

1944

6.2