2001

6.2

1975

1.0

1997

6.5

1973

3.2

1962

7.3

2006

6.3

1994

3.2

1961

4.6

1972

6.2

1975

5.7

1981

6.4

2007

6.7

2004

5.5

1979

5.3

2008

0.0

1995

6.5

1990

6.7

1965

6.3

2005

5.9

1982

1.7