1968

6.9

2015

6.4

2003

8.7

1993

6.1

2011

6.3

2010

6.2

2012

5.4

1997

6.0

2003

6.4

2009

4.7

2021

6.8

2014

6.1

2010

6.3

2001

6.1

2011

6.0

2015

5.5

2004

4.8

2018

7.2

1985

5.1

2013

7.1