2015

6.5

1985

8.3

2010

6.6

2017

6.1

1997

7.9

2006

6.7

1990

7.4

1994

8.7

2016

7.6

1995

8.0

2007

6.3

2016

7.8

2006

6.6

2015

7.3

1997

7.5

2008

8.5

2001

7.9

2010

7.2

2016

8.5

2016

7.0