6.1.1. A census
It is possible to approach most of the beekeeper population in smaller countries such as the Netherlands, where questionnaires are included in both of the two beekeeper journals, which are sent to all Dutch beekeepers who are by their membership of a local organization also a member of a national association (>90%). The questionnaire could be returned without postal costs. Beekeepers who provided an email address (>85%) in the past received a personalised link to the online questionnaire. In 2012, about 70% of the data was submitted this way and processed immediately, which reduced costs substantially. This approach is in fact not sampling, but addressing the total population of organized beekeepers.