2010

6.7

1998

7.2

2004

8.3

1984

7.2

1999

7.4

2008

7.7

2005

7.7

2015

7.8

1996

5.4

1995

8.1

2009

7.0

2015

7.5

1994

6.8

2011

6.7

2007

7.5

1990

7.5

2007

7.9

2001

6.6

2013

7.3

1983

7.3