Samples analysed by IZSLER (number of head)
Survey date	2022	2023	2024
January	7.285	6.949	7.737
February	7.374	7.036	7.607
March	7.249	7.016	8.014
April	7.171	6.972	7.497
May	7.815	7.192	7.621
June	7.047	6.843	7.509
July	6.839	7.691
August	6.799	7.513
September	7.069	7.612
October	6.964	7.933
November	7.075	7.640
December	7.099	7.553