2006

6.9

2001

6.7

1998

7.9

1999

6.2

2014

5.7

2013

8.0

2011

7.4

2009

4.3

1994

8.4

2001

2.0

2015

4.9

1972

7.7

1999

7.5

2005

8.1

2004

7.4

2004

7.0

2007

10.0

2010

7.4

2003

8.6

2016

8.0