2004

3.8

1992

4.9

1998

5.8

1977

4.1

2002

6.4

2017

6.7

2008

6.8

1989

6.0

1991

5.6

2011

5.0

2006

0.0

2015

4.6

2009

6.0

2019

6.0

2019

7.1

1946

6.0

1965

0.0

2017

0.0

2018

0.0

2019

2.6