Please help ensure whether there is seasonal effect in time series

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Please tell me what transform I should use for the data and what model is most appropriate.
Do you think there is seasonal variation in these time series data?
Thank you very much!

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关键词：Time Series seasonal Whether Effect please Effect Series please Whether ensure

why did you speak in english ?where are you come from?

whether there exists seasonal effects should be told by statistics, you file can not be open