(27)In order to improve the efficiency of the statistical production processes within the ESS and to reduce the administrative burden on respondents, NSIs and other national authorities should have the right to access and use, promptly and free of charge, any administrative data that are needed for public purposes, irrespective of whether they are held by public, semi-public or private bodies. NSIs and other national authorities should also be able to integrate those administrative data with statistics to the extent that such data are necessary for developing, producing and disseminating European agricultural statistics, in accordance with Article 17a of Regulation (EC) No 223/2009.