1981

5.2

1997

6.0

2008

5.6

1995

0.0

1994

1.0

2013

0.0

1983

0.0

2006

1.0

2019

6.1

2005

7.6

2015

5.4

1999

5.5

2003

6.7

1986

7.5

2007

4.7

2012

6.0