1980

6.6

1982

6.4

1989

10.0

2014

3.0

2007

6.7

1984

7.2

1999

7.6

2008

6.3

1994

5.4

2006

6.8

2003

6.3

2007

5.0

2018

8.0

2017

7.6

2010

6.2

2009

6.6

2009

6.0

1986

6.3

2017

6.0

2005

6.1