Samples analysed by IZSLER (number of head)
Survey date	2023	2024	2025
January	6.949	7.737	7.350
February	7.036	7.607	7.131
March	7.016	8.014	7.487
April	6.972	7.497
May	7.192	7.621
June	6.843	7.509
July	7.691	7.851
August	7.513	7.304
September	7.612	7.294
October	7.933	7.337
November	7.640	7.469
December	7.553	7.088