0.0

2011

0.0

2009

1.5

2009

1.3

1982

0.0

2003

5.1

2005

7.0

2005

3.5

2006

5.0

1999

6.2

2006

4.7

1987

6.5

2000

6.0

1994

6.0

1993

5.7

1991

7.3

1988

7.8

2006

6.6

2006

2.5

2004

7.5