2003

4.2

1976

8.0

2010

7.2

1995

6.1

2002

6.0

1994

6.7

2008

5.9

2014

5.4

2008

6.5

2017

4.9

1999

6.8

2001

6.1

2004

7.0

2008

6.4

2006

5.8

2000

6.6

2002

6.4

2005

6.8

1974

0.0

1977

7.7