1998

6.1

2005

5.3

2015

7.8

1994

8.5

1994

8.7

2006

7.4

2012

7.8

1997

7.9

2002

8.4

2016

7.0

1983

7.9

2010

7.1

2014

8.5

2014

7.7

2018

7.6

2018

7.4

2009

7.6

1993

8.0

2015

6.8

2003

6.3