1987

7.1

2012

6.8

1992

6.2

2000

7.5

2018

7.5

2008

8.1

2010

7.8

2011

3.8

1996

4.0

2018

7.1

2011

7.4

2006

7.9

1988

6.6

2001

8.2

2004

8.0

1997

8.3

2015

7.3

2005

8.3

2004

7.2

1995

7.7

2016

7.6

2003

7.3