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:
| Name(s) | Yard no. | Type (as built) | Owner | IMO number | Laid down | Launched | Delivered/\nCommissioned | Fate/\nDecommissioned | Notes |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Sally | 100 | Yacht | Lyman | Unknown | Unknown | Unknown | Unknown | Unknown |  |
| Caprice | 101 | Yacht | Robinson | Unknown | Unknown | Unknown | Unknown | Unknown |  |
| Eleanor | 103 | Yacht | Clapp | Unknown | Unknown | Unknown | Unknown | Unknown |  |
| USS Lawrence (DD-8) | 104 | Bainbridge-class destroyer | U.S. Navy | Unknown | 10 April 1899 | 7 November 1900 | 7 April 1903 | 20 June 1919 | Sold to Joseph G. Hitner; scrapped |
| USS Macdonough (DD-9) | 105 | Bainbridge-class destroyer | U.S. Navy | Unknown | 10 April 1899 | 24 December 1900 | 5 September 1903 | 3 September 1919 | Sold to Joseph G. Hitner; scrapped |
| Jule | 106 | Yacht | J. Arthur | Unknown | Unknown | Unknown | 12 June 1899 | Unknown |  |
| United States lightship LV-72 | 107 | Lightvessel | U.S Lighthouse Board | Unknown | Unknown | Unknown | 13 February 1901 | Unknown |  |
Question:
tell me the total number that were laid down on an unknown date.
Answer:
5