2010

6.9

2012

6.8

2007

7.9

2015

7.3

1999

7.8

1992

8.2

2014

6.3

2005

8.1

2000

7.9

2005

7.0

2015

7.7

2017

8.1

2010

8.6

2016

7.3

2012

8.3

2015

6.6

1990

6.9

2017

7.9

2011

8.3

2007

7.9