1988

6.2

2015

4.6

2014

5.7

2006

6.1

2019

7.0

1994

6.6

2014

6.9

2017

6.0

6.6

1991

6.2

1995

4.6

2012

5.5

2010

7.2

2009

7.2

2008

5.8

1985

6.7

2015

6.3

1993

4.9

1980

8.4

2015

7.1