Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Date | Name of ship | Nationality | Tonnage | Fate |
| --- | --- | --- | --- | --- |
| 17 October 1939 | City of Mandalay | UK | 7028.0 | Sunk |
| 21 December 1939 | Rudolf | Norway | 924.0 | Sunk |
| 6 June 1940 | HMSCarinthia | UK | 20277.0 | Sunk |
| 9 June 1940 | Margareta | UK | 2155.0 | Sunk |
| 11 June 1940 | Athelprince | UK | 8782.0 | Damaged |
| 12 June 1940 | Barbara Marie | UK | 4223.0 | Sunk |
| 12 June 1940 | Willowbank | UK | 5041.0 | Sunk |
| 17 June 1940 | Elpis | UK | 3651.0 | Sunk |
| 16 August 1940 | Alcinuos | Netherlands | 6189.0 | Damaged |
| 16 August 1940 | Leonidas M. Valmas | Greece | 2080.0 | Total loss |
| 27 August 1940 | HMS Dunvegan Castle | UK | 15007.0 | Sunk |
| 31 August 1940 | Ville de Hasselt | Belgium | 7461.0 | Sunk |
| 2 September 1940 | Thornlea | UK | 4261.0 | Sunk |
| 4 September 1940 | Lumineach | Ireland | 1074.0 | Sunk |
| 26 September 1940 | Coast Wings | UK | 862.0 | Sunk |
| 26 September 1940 | Siljan | Sweden | 3058.0 | Sunk |
| 18 October 1940 | Beatus | UK | 4885.0 | Sunk |
| 18 October 1940 | Convallera | Sweden | 1996.0 | Sunk |
| 18 October 1940 | Gunborg | Sweden | 1572.0 | Sunk |
| 18 October 1940 | Ruperra | UK | 4548.0 | Sunk |
| 20 October 1940 | Janus | Sweden | 9965.0 | Sunk |
| 29 March 1941 | Liguria | Sweden | 1751.0 | Sunk |
| 31 March 1941 | Castor | Sweden | 8714.0 | Sunk |
| 2 April 1941 | British Reliance | UK | 7000.0 | Sunk |
| 3 April 1941 | Alderpool | UK | 4313.0 | Damaged |
| 8 June 1941 | Ensis | UK | 6207.0 | Sunk |
| 9 June 1941 | Phidias | UK | 5623.0 | Sunk |
Question:
What was the average tonnage for the Siljan ship from Sweden?
Answer:
3058.0