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:
| Number | Name | Meaning | Fleet | Launched |
| --- | --- | --- | --- | --- |
| L1 | Leninets (Ленинец) | Follower of Lenin | Baltic | 28 February 1931 |
| L2 | Stalinets (Сталинец) | Follower of Stalin | Baltic | 21 May 1931 |
| L3 | Frunzenets (Фрунзенец) | Follower of Frunze | Baltic | 8 August 1931 |
| L4 | Garibaldets (Гарибальдиец) | Follower of Garibaldi | Black Sea | 31 August 1931 |
| L5 | Chartist (Чартист) | An adherent of Chartism | Black Sea | 5 June 1932 |
| L6 | Carbonari (Карбонарий) | Carbonari | Black Sea | 3 November 1932 |
Question:
when was garibaldets (гарибальдиец) launched?
Answer:
31 August 1931