2006

6.1

1994

5.7

1975

4.5

2005

6.1

2005

4.9

1976

4.8

1950

6.7

2007

5.6

2005

7.2

2001

7.5

1979

6.0

1990

6.7

2000

5.0

2005

6.2

2007

1.0

2008

5.3

2004

4.7

1980

4.8

1986

6.7

1984

0.0