1967

6.9

2001

4.0

1998

6.0

2009

6.0

2017

8.1

2013

6.1

2019

6.6

2008

5.6

2007

6.5

2003

5.0

1978

6.1

2003

6.0

1995

7.7

2010

6.1

2006

4.6

2003

5.8

2002

6.2

2015

6.3

2001

4.7

2023

7.2