Participating Countries by Survey Years

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	1983/84	1985/86	1989/90	1993/94	1997/98	2001/02	2005/06	2009/10	2013/14	2017/18
Albania									√	√
Armenia								√	√	√
Austria	√	√	√	√	√	√	√	√	√	√
Azerbaijan										√
Belgium (Flemish)			√*	√	√	√	√	√	√	√
Belgium (French)		√	√*	√	√	√	√	√	√	√
Bulgaria							√		√	√
Canada			√	√	√	√	√	√	√	√
Croatia						√	√	√	√	√
Czech Republic				√	√	√	√	√	√	√
Denmark	√**	√**	√**	√	√	√	√	√	√	√
England	√				√	√	√	√	√	√
Estonia				√	√	√	√	√	√	√
Finland	√	√	√	√	√	√	√	√	√	√
France				√	√	√	√	√	√	√
Georgia										√
Germany				√	√	√	√	√	√	√
Greece					√	√	√	√	√	√
Greenland				√	√	√	√	√	√	√
Hungary		√	√	√	√	√	√	√	√	√
Iceland							√	√	√	√
Ireland					√	√	√	√	√	√
Israel		√	√	√	√	√	√	√	√	√**
Italy						√	√	√	√	√
Kazakhstan										√
Latvia			√**	√	√	√	√	√	√	√
Lithuania				√	√	√	√	√	√	√
Luxembourg							√	√	√	√
Malta						√	√	√	√	√
Moldova									√	√
Netherlands		√**	√**			√	√	√	√	√
North Macedonia						√	√	√	√	√
Northern Ireland			√**	√	√
Norway	√	√	√	√	√	√	√	√	√	√
Poland			√	√	√	√	√	√	√	√
Portugal					√	√	√	√	√	√
Romania							√	√	√	√
Russian Federation				√	√	√	√	√	√	√
Scotland		√	√	√	√	√	√	√	√	√
Serbia										√
Slovakia				√	√	√	√	√	√	√
Slovenia						√	√	√	√	√
Spain		√	√	√		√	√	√	√	√
Sweden		√	√	√	√	√	√	√	√	√
Switzerland		√	√	√	√	√	√	√	√	√
Turkey							√	√		√**
Ukraine						√	√	√	√	√
USA					√	√	√	√
Wales		√	√	√	√	√	√	√	√	√

* a single national file was submitted

** carried out survey after scheduled fieldwork dates

30.08.2021