2008

6.2

2006

6.7

2006

6.0

2004

5.9

1971

0.0

2005

6.3

1997

6.6

1992

5.0

2003

4.4

2002

6.2

1975

3.3

1981

2.0

1972

4.4

1972

3.4

1975

1.0

1972

1.0

1978

7.5

1981

0.0

1980

2.0

1975

1.0