2014

3.7

1998

7.3

2013

5.3

1978

7.5

2007

6.5

2008

5.8

2008

5.6

1986

5.0

2016

7.1

2017

8.1

2011

6.0

2009

6.6

1996

0.0

2020

6.3

1985

8.3

2001

4.7

2009

6.3

2019

6.6

2013

6.7

2003

4.7