1981

5.2

2001

6.2

2018

5.5

1984

6.9

1994

5.6

1997

0.0

2008

0.0

2020

6.1

2013

3.5

2007

9.0

1997

5.5

2011

0.0

2015

5.1

2012

0.0

2004

5.9

1971

6.4

1999

5.5

2004

6.1

1995

4.8

2016

5.0

2023

7.0