1975

3.1

2006

4.6

1979

6.2

2003

6.2

2017

0.0

2004

5.2

1998

4.1

2000

5.7

1967

6.9

2002

5.1

2025

0.0

2006

6.2

2003

6.0

2016

6.8

1978

6.1

2009

7.5

2003

5.0

1995

6.5

2001

4.0

2007

6.9