1968

6.2

1994

8.7

2012

7.1

2012

7.2

2008

8.0

2007

6.5

2016

7.6

2007

7.3

1998

8.2

2013

6.0

2011

6.7

2014

8.0

1995

7.9

2007

6.7

1985

6.6

2010

7.7

1999

8.4

2004

5.9

1999

8.0

1941

8.0