2012

6.8

2015

8.2

2011

8.1

1996

6.4

2008

7.6

2010

7.7

2001

8.4

2013

7.9

2014

6.7

1990

7.4

2013

8.0

1987

7.7

2004

8.1

1999

7.8

1984

7.4

1996

7.0

2000

6.6

2017

8.1

2008

7.6

2000

8.1