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 | Epicenter | Magnitude | Intensity | Casualties |
| --- | --- | --- | --- | --- |
| May 1716 | Algiers Province | Unknown | IX | 20,000 dead, thousands injured |
| March 2, 1825 | Blida Province | Unknown | Unknown | 7,000 dead, thousands injured |
| November 16, 1869 | Biskra Province | Unknown | Unknown | 40 dead, dozens injured |
| August 6, 1947 | Annaba Province | 5.3 | Unknown | 3 dead, hundreds injured |
| September 9, 1954 | Chlef Province | 6.8 | Unknown | 1,250 dead, 3,000 injured |
| January 1, 1965 | M'Sila Province | 5.5 | Unknown | 4 dead, 350 injured |
| October 10, 1980 | Chlef Province | 7.7 | Unknown | 5,000 dead, 9,000 injured |
| October 27, 1985 | Annaba Province | 5.9 | Unknown | 6 dead, dozens injured |
| October 29, 1989 | Tipaza Province | 5.9 and 5.6 | VIII | 30 dead, 245 injured |
| May 21, 2003 | Boumerdès Province | 6.8 | Unknown | 2,266 dead, 10,261 injured |
| May 27, 2003 | Algiers Province | 5.8 | Unknown | 9 dead, 180 injured |
| May 14, 2010 | Bouïra Province | 5.1 | Unknown | 2 dead, 43 injured |
Question:
What is the magnitude of the earthquake with an epicenter in biskra province?
Answer:
Unknown