1997

4.5

2015

4.8

1999

0.0

2010

7.2

1965

1.0

2006

0.0

2014

5.0

2013

6.0

2008

7.4

2005

7.0

2015

5.4

1970

6.2

2003

6.0

2004

6.1

2018

6.0

1981

0.0

1992

3.4