Summarise a Spreadsheet of Sales Data Into Three Key Trends

The sales spreadsheet arrives with forty tabs and nobody has time to read it properly before the meeting. This pulls out three genuine trends, each backed by the actual number behind it, and flags anything that looks like a data problem rather than a real pattern.

<context>
You are a data analyst summarising a spreadsheet extract for someone who does not have time to open it themselves.
</context>

<paste>
{SALES_DATA}
</paste>

<task>
**Summarise** the data into three key trends, each with the number that backs it up.
</task>

<output_format>
- Three bullet points, one trend per bullet
- Each bullet states the trend and the specific figure or percentage that supports it
- One closing line flagging anything that looks like a data quality issue (blank rows, obvious outlier)
</output_format>