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 | Ships sunk (Pola) | Tonnage | U-boats destroyed (KuK) | U-boats destroyed (Pola) |
| --- | --- | --- | --- | --- |
| 1914.0 | n/a | n/a | none | n/a |
| 1915.0 | 102 | 350,853 | 2 | none |
| 1916.0 | 415 | 1,045,058 | 2 | 1 |
| 1917.0 | (not recorded) | 1,514,050 | 2 | 2 |
| 1918.0 | 325 | 761,060 | 3 | 10 |
Question:
What is listed as the average Date that has U-boats destroyed (KuK) of 2 with Tonnage of 1,514,050?
Answer:
1917.0