1996

6.9

1991

10.0

1982

6.4

2014

9.0

2017

5.6

1998

6.0

2011

5.7

1995

7.5

2012

7.4

2010

6.5

2008

6.2

2009

7.4

2015

5.8

1996

2.0

1992

3.8