1993

5.5

2015

8.4

1976

4.8

2020

6.0

2011

9.5

2014

8.4

2012

9.7

1971

6.8

1987

6.9

2001

6.8

2013

8.4

2006

6.1

2013

6.6

2014

4.5

2000

7.4

2003

5.7

2007

6.9

0.0

2017

6.1