2007

3.4

2007

2.8

1975

0.0

1975

5.2

1966

5.4

2003

6.1

2006

4.6

1981

6.4

1972

3.7

2002

5.3

2003

6.2

2005

5.5

2006

5.5

2007

5.7

2008

6.3

2002

5.7

1976

4.8

1991

4.6

1999

6.6

1976

5.0