2006

5.4

2004

4.8

2001

6.1

1976

3.3

1994

5.7

1993

5.0

2001

6.2

2004

1.0

1973

3.7

2005

6.2

1980

1.0

2005

5.9

2001

7.3

1984

6.0

1997

6.8

2005

6.7

2005

6.8

1975

3.8

1993

3.5

1976

3.5