1980

6.8

2008

5.2

2007

9.8

2015

6.3

1988

7.8

2013

5.8

2022

5.5

1989

6.0

2009

8.5

2017

6.5

2010

7.0

2016

7.4

2013

7.6

2011

8.3

2014

5.4

1977

7.6

1984

7.0

2014

6.9

2009

7.6

2013

6.9