<p>Until 2007, the survey was conducted every month except August.<br /><br />Since 2008, it takes place every month.<br /><br />Data collection is by post and via the internet over a period that extends from the end of the month preceding the survey month to the survey publication date, i.e. 4 business days before the end of the current month.<br /><br />Survey results are sent to the European Commission 4 business days before the end of the month.</p>