2004

5.6

1987

5.7

1965

6.3

2005

5.9

1962

7.3

1994

3.2

2007

6.7

1990

6.8

1997

6.8

1995

5.0

2006

6.3

1979

5.3

2004

5.5

1982

1.7

1995

6.5

1973

3.7

1997

6.5

2001

6.2

2008

0.0

1996

2.4