2005

7.8

2004

6.6

2016

6.9

2001

7.3

2009

7.7

1998

5.5

2011

6.9

2005

6.3

2012

6.5

2013

7.2

1977

8.2

1992

6.3

2001

7.9

2013

6.9

2013

5.6

2013

5.7

2007

7.5

2012

5.9

2008

6.5

1996

6.2