2002

3.9

1978

6.3

2002

6.2

2005

6.3

1970

3.8

2001

6.6

2002

5.3

2008

5.7

2003

5.0

2005

6.2

1975

7.3

2006

6.7

2006

6.0

2004

5.9

1972

6.1

1984

3.3

2013

6.8

2004

5.5

2000

5.1

2004

4.8