Table:
Ships sunk or damaged by SM U-40[17]

Date
Name
Tonnage
Nationality

19 August 1917
Gartness
2,422
British

29 August 1917
Clifftower*
3,509
British

1 January 1918
Sandon Hall
5,134
British

19 March 1918
Lord Ormonde*
3,914
Canadian

20 March 1918
Antonios M. Theophilatos[1][Note 4]
2,282
Greek

Sunk:
Damaged:
Total:
9,838
7,423
17,261

Please ascertain the quantity of rows and columns within the provided table. Provide the final answer in the JSON structure, using the format {"row_number": "m", "column_number": "n"}.

This table has 7 rows and 4 columns. Thus, the final answer is {"row_number": "7", "column_number": "4"}.