2005

4.3

2002

6.2

1986

7.0

2003

6.1

2005

6.2

2002

7.6

2006

6.6

2008

5.7

1989

6.6

1991

6.9

2002

3.9

2008

6.2

2006

6.7

2006

6.0

2004

5.9

2002

6.6

2002

6.3

2001

6.6

2002

5.3

1978

4.7