2006

6.9

2003

7.1

2007

5.9

2001

5.6

2007

7.7

2008

6.4

1965

6.3

2004

4.2

2004

7.3

2006

5.6

2004

6.1

2005

6.2

1985

6.7

1988

7.1

2004

7.4

2005

7.7

1981

5.5

1979

6.8

2007

6.7

2001

7.5