2002

5.3

2008

4.6

2005

5.7

2016

6.8

2009

5.5

2003

5.3

2013

6.9

2004

7.4

1983

6.0

1973

4.8

1995

4.9

1983

5.7

2006

5.5

1987

6.2

2004

4.1

1997

4.7

2000

5.2

1983

5.8

1993

5.9

2005

5.9