1969

5.2

2018

6.7

1993

4.3

1987

6.9

2011

5.5

2014

5.2

2015

6.6

1976

8.0

2012

6.7

2007

6.1

2009

8.5

2013

3.8

2016

3.7

2009

6.4

2024

5.9

2009

7.8

2004

4.2

2009

5.7

2004

7.7