2017

6.7

2002

6.3

2004

5.5

1992

5.0

2004

3.8

1998

5.8

1977

4.1

2008

6.8

1989

6.0

1991

5.8

2011

5.3

2015

4.5

2009

6.0

2005

0.0

1954

3.7

0.0

1993

0.0

2019

4.5