1975

4.8

1980

5.4

1982

4.8

2012

6.8

2017

5.5

1973

4.1

1984

2.0

1969

5.0

2004

4.0

1978

4.2

1983

4.5

2009

2.3

2001

4.0

2006

6.5

2021

3.8

1999

4.5

1973

4.4

2008

0.0

1968

2.9

2010

1.0