1997

5.4

1998

6.8

2007

1.0

2007

6.5

2004

6.6

2001

3.0

2006

1.0

2006

3.5

2005

0.0

2001

9.4

2011

6.9

1970

6.1

1995

4.5

1999

6.8

2007

7.0