2014

6.8

1968

6.9

2012

9.7

2011

7.1

2021

7.7

1993

6.1

1984

9.2

2014

5.7

2009

6.7

7.8

1984

7.1

1977

8.0

2018

7.0

2013

7.6

2015

7.4

2006

7.5

2003

6.1

1967

7.7

1957

6.9