2007

4.9

1985

6.5

2010

6.6

2009

6.7

1977

6.8

2001

5.2

1982

5.9

1981

6.2

2003

6.0

2013

7.6

2013

6.0

2008

4.9

2004

10.0

1987

5.5

1996

5.9

2005

7.4

2004

9.9

2012

7.8

1993

4.6

1969

6.6