2004

2.7

2006

6.9

2003

7.1

2007

5.9

2001

5.6

2007

7.7

1965

6.3

2004

7.3

2006

5.6

2004

6.1

2005

6.2

2004

7.4

2005

7.7

1979

6.8

2007

6.7

2001

7.5

1997

7.2

2002

7.6

1995

6.7

2006

0.0