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:
| Administrative\narea | Area\nkm2 | Area\nsq mi | Population | Administrative\ncentre |
| --- | --- | --- | --- | --- |
| Saint Helena | 122 | 47 | 5,809 | Jamestown |
| Ascension Island | 91 | 35 | 1,532 | Georgetown |
| Tristan da Cunha | 184 | 71 | 388 | Edinburgh of the Seven Seas |
| Tristan da Cunha | 98 | 38 | 382 | Edinburgh of the Seven Seas |
| Inaccessible Island | 14 | 5 | 0 | denstone hut |
| Nightingale Island | 3.2 | 1 | 0 | West Landing |
| Gough Island | 68 | 26 | 6 | Transvaal Bay |
| Total | 397 | 153 | 7,729 | Jamestown |
Question:
how many administrative areas have a population below 500?
Answer:
5