2005

6.7

1998

8.1

2012

7.2

1999

8.4

2014

7.9

2009

7.6

2010

8.4

1987

7.3

2004

7.7

2008

7.6

2012

6.5

2000

7.8

2016

7.3

1994

8.7

2013

6.0

2005

7.5

2006

7.9

2003

6.7

1987

8.1

2001

7.9