Advice needed- have been sending wrong numbers to the leadership for this whole year and only just now realised

So I send out our company’s monthly market-share update to the leadership - i was handed over that project at the start of this year and these were new numbers I was dealing with so I didn’t have much flair for an eyeballing the data and thus, could never realise my mistake earlier. The wrong numbers were pretty similar to the trend last year and so neither did any of my managers red-flag it. The problem is, today, when I …

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