2011

5.7

1967

6.5

1980

6.7

2006

5.5

1994

7.1

2001

7.5

2007

7.2

2015

7.8

2013

6.0

1981

7.9

1997

6.2

2009

5.6

1993

7.5

1998

6.0

2011

6.6

1973

5.7

2013

7.2

2013

6.3

1978

6.0

2008

6.1