1974

0.0

2013

8.5

2017

3.9

2013

7.1

2008

6.0

2000

2.0

2021

6.2

1971

0.0

2010

5.0

2014

6.5

2004

4.4

2015

8.3

2002

7.7

1996

8.0

2010

7.6

2008

2.0

2009

5.2

2005

0.0

2006

7.7

2004

5.7