1981

6.6

1997

6.8

2010

3.5

2006

8.2

2015

0.0

2011

8.5

2019

7.0

2013

7.1

2007

5.8

1985

7.2

2015

7.5

2014

8.2

1998

5.4

2005

7.0

1991

0.0

2008

9.0

2012

6.9

2010

4.3

1999

6.4

2005

6.7