1996

6.8

1991

10.0

1982

6.3

2014

9.0

2017

5.6

1998

6.0

1999

6.8

2011

5.7

1995

5.0

2012

7.4

2010

6.5

2008

6.2

2009

7.4

2015

6.0

1996

2.0

1992

3.8