For each approved annual or multiannual survey programme, Member States shall submit to the Commission, by 30 April each year, an annual detailed technical and financial report covering the previous year. That report shall include the results achieved, measured on the basis of the indicators referred to in Articles 21(2)(g) and a detailed account of eligible costs incurred. In addition, for each approved annual survey programme, Member States shall submit to the Commission, by 31 August each year, an intermediate financial report.