1983

7.6

2000

4.0

2014

7.9

2013

8.0

1980

8.2

2015

6.1

2010

8.4

2017

7.2

1999

6.9

2004

7.5

2017

7.2

2013

6.9

2013

7.3

1989

7.2

2015

7.9

2014

7.1

2004

7.2

2017

7.2

2010

7.4

2016

6.7