Argentina
Austria
Australia
Belgium
Brazil
Bulgaria
Canada
China
Denmark
Estonia
Finland
France
Germany
Hungary
India
Ireland
Israel
Italy
Japan
Latvia
Lithuania
Netherlands
New Zealand
Norway
Peru
Poland
Portugal
Republic of Korea
Romania
Russia
Slovak Republic/Czechoslovakia
Slovenia/Yugoslavia
South Africa
Spain
Sweden
Turkey
United Kingdom
USA
1 person sampled per household
north-west
north-east
centre
south
islands