2002

4.2

2009

2.7

1977

3.0

1988

3.0

1979

6.0

1976

0.0

2007

5.8

1993

5.6

2020

0.0

1971

4.5

2021

2.0

2015

4.1

2015

6.3

1993

3.5

2014

5.3

1998

4.1

1995

1.0

2012

6.2

2017

5.0

2018

4.2