2012

5.8

2013

6.9

2007

6.4

2002

8.4

2011

7.4

2007

5.7

2000

7.8

1997

6.6

2013

6.9

2008

8.5

1991

8.3

2001

6.2

2014

7.5

2008

6.6

2008

6.1

2012

7.4

2002

7.3

2003

6.2

1997

7.2