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:
| Vessel | Origin | Type | In service | Unit |
| --- | --- | --- | --- | --- |
| Xavery Czernicki Class | Poland | Logistic Support | 1.0 | 2nd Minelaying and Transport Squadron |
| Lublin Class | Poland | Landing Craft | 5.0 | 2nd Minelaying and Transport Squadron |
| Deba Class | Poland | Landing Craft | 3.0 | 2nd Minelaying and Transport Squadron |
| Gardno Class | Poland | Minesweeper | 12.0 | 12th Minesweeper Squadron |
| Various Class | Poland | auxiliary vessels | 14.0 | Naval Base Swinoujscie (auxiliary squadron) |
Question:
What is the highest In service for a vessel with a listed Unit of 12th minesweeper squadron?
Answer:
12.0