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:
| Election number | Election date | District | Province | Took office | Left office |
| --- | --- | --- | --- | --- | --- |
| 9.0 | 1837-9-22 | At large | Seville | 1837-12-19 | 1839-06-01 |
| 11.0 | 1840-1-19 | At large | Ávila | 1840-02-21 | 1840-10-11 |
| 14.0 | 1843-9-15 | At large | Badajoz | 1843-10-18 | 1844-07-10 |
| 15.0 | 1844-9-3 | At large | Badajoz | 1844-10-14 | 1846-10-31 |
| 16.0 | 1846-6-21 | Fregenal de la Sierra | Badajoz | 1847-01-03 | 1848-12-18 |
| 16.0 | 1846-6-21 | Fregenal de la Sierra | Badajoz | 1847-12-20 | 1850-08-04 |
| 17.0 | 1850-8-31 | Fregenal de la Sierra | Badajoz | 1850-11-06 | 1851-04-07 |
| 17.0 | 1850-8-31 | Huelva | Huelva | 1850-11-06 | 1850-11-15 |
| 18.0 | 1851-5-10 | Elche de la Sierra | Albacete | 1851-06-04 | 1851-06-17 |
| 18.0 | 1851-5-10 | Fregenal de la Sierra | Badajoz | 1851-06-04 | 1852-12-02 |
| 19.0 | 1853-2-4 | Fregenal de la Sierra | Badajoz | 1853-03-15 | 1853-12-10 |
Question:
What is the election date for those politicians who left office on 1850-11-15?
Answer:
1.0