2006

5.7

1973

7.0

2010

6.3

2016

6.2

1991

8.1

1975

7.4

2008

7.6

2007

6.7

2017

6.6

2013

6.1

2008

7.2

1984

8.0

1993

7.1

2011

7.9

1999

7.5

1972

7.1

2016

8.5

2004

8.1

2000

6.5

1962

7.2