Client Reports their SQL Server Database Primary Data File has grown considerably.


Request the client to  run a "Disk Usage By Table" Standard Report for us on that database:

Right click on the database in the Object Explorer in Management Studio
Navigate to Reports > Standard Reports > Disk Usage By Table
They are able to use the small arrows to Sort the "Data (KB)" column
Right click on the report table produced > Export > PDF


Alternatively.

When in Management Studio, hit F7 to open Object Explorer Details.
Right click on the Column header row and choose "Data Space Used (KB)". This will add a column with the table size.
Click on the new column to sort


Email the PDF to support.


There is also a SQL Script you can run:

SELECT
    t.NAME AS TableName,
    s.Name AS SchemaName,
    p.rows AS RowCounts,
    SUM(a.total_pages) * 8 AS TotalSpaceKB,
    SUM(a.used_pages) * 8 AS UsedSpaceKB,
    (SUM(a.total_pages) - SUM(a.used_pages)) * 8 AS UnusedSpaceKB
FROM
    sys.tables t
INNER JOIN
    sys.indexes i ON t.OBJECT_ID = i.object_id
INNER JOIN
    sys.partitions p ON i.object_id = p.OBJECT_ID AND i.index_id = p.index_id
INNER JOIN
    sys.allocation_units a ON p.partition_id = a.container_id
LEFT OUTER JOIN
    sys.schemas s ON t.schema_id = s.schema_id
WHERE
    t.NAME NOT LIKE 'dt%'
    AND t.is_ms_shipped = 0
    AND i.OBJECT_ID > 255
GROUP BY
    t.Name, s.Name, p.Rows
ORDER BY
    t.Name