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:
| Story No. | Episode | Title | Directed by | Written by | UK viewers (million) | AI (%) | Original air date | Production code |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 157 | 1.0 | " Rose " | Keith Boak | Russell T Davies | 10.81 | 81.0 | 26March2005 | 1.1 |
| 158 | 2.0 | " The End of the World " | Euros Lyn | Russell T Davies | 7.97 | 79.0 | 2April2005 | 1.2 |
| 159 | 3.0 | " The Unquiet Dead " | Euros Lyn | Mark Gatiss | 8.86 | 80.0 | 9April2005 | 1.3 |
| 160a | 4.0 | " Aliens of London " | Keith Boak | Russell T Davies | 7.63 | 81.0 | 16April2005 | 1.4 |
| 160b | 5.0 | " World War Three " | Keith Boak | Russell T Davies | 7.98 | 82.0 | 23April2005 | 1.5 |
| 161 | 6.0 | " Dalek " | Joe Ahearne | Robert Shearman | 8.63 | 84.0 | 30April2005 | 1.6 |
| 162 | 7.0 | " The Long Game " | Brian Grant | Russell T Davies | 8.01 | 81.0 | 7May2005 | 1.7 |
| 163 | 8.0 | " Father's Day " | Joe Ahearne | Paul Cornell | 8.06 | 83.0 | 14May2005 | 1.8 |
| 164a | 9.0 | " The Empty Child " | James Hawes | Steven Moffat | 7.11 | 84.0 | 21May2005 | 1.9 |
| 164b | 10.0 | " The Doctor Dances " | James Hawes | Steven Moffat | 6.86 | 85.0 | 28May2005 | 1.10 |
| 165 | 11.0 | " Boom Town " | Joe Ahearne | Russell T Davies | 7.68 | 82.0 | 4June2005 | 1.11 |
| 166a | 12.0 | " Bad Wolf " | Joe Ahearne | Russell T Davies | 6.81 | 85.0 | 11June2005 | 1.12 |
Question:
Name the least ai %
Answer:
79.0