1999

7.9

2011

3.3

2012

7.2

1997

8.1

2014

4.3

1998

8.2

2005

8.3

2002

7.7

2008

5.2

1993

7.7

2017

5.2

2003

6.7

2010

6.8

2008

8.4

2001

7.4

1995

6.6