2003

6.2

2012

5.4

2013

6.3

2015

7.2

1976

6.7

8.0

2011

6.7

2015

6.0

2004

6.6

1971

6.1

1994

7.5

2017

7.7

2005

5.5

1977

7.1

2020

5.8

2014

5.8

1991

6.7

2015

6.7

1977

6.7

2002

6.1