Member States shall keep statistics on the number of alerts the retention periods of which have been extended in accordance with paragraph 4 of this Article and transmit them, upon request, to the supervisory authorities referred to in Article 55.
Coimeádfaidh na Ballstáit staidreamh faoin líon foláireamh a bhfadaítear an tréimhse choinneála ina leith i gcomhréir le mír 4 den Airteagal seo agus déanfaidh siad an staidreamh a tharchur, arna iarraidh sin dóibh, do na húdaráis mhaoirseachta dá dtagraítear in Airteagal 55.