2003

5.5

1985

4.5

1980

5.6

2007

6.2

2001

6.0

2005

7.0

2012

4.4

2002

6.2

1997

6.8

2005

6.7

2014

5.4

2005

7.0

2005

6.2

0.0

2000

3.6

2005

5.1

1981

5.9

2009

5.4

2010

1.5

2009

6.4