1986

5.8

2008

6.7

1987

5.3

1970

7.0

1995

6.3

2007

6.5

2004

7.3

2001

6.2

2007

6.1

2011

5.9

2007

5.3

2011

6.5

2003

6.2

2008

6.7

2007

5.8

2012

6.3

2009

6.0

2008

5.2

1989

7.9

2009

5.3