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:
| Episode | Date | Official ITV rating (millions) | Weekly rank | Share (%) | Official ITV HD rating (millions) | Total ITV viewers (millions) |
| --- | --- | --- | --- | --- | --- | --- |
| Auditions 1 | 13 April | 9.58 | 1.0 | 36.9 | 1.15 | 10.73 |
| Auditions 2 | 20 April | 9.72 | 1.0 | 43.9 | 1.43 | 11.15 |
| Auditions 3 | 27 April | 9.17 | 1.0 | 43.9 | 1.31 | 10.48 |
| Auditions 4 | 4 May | 9.60 | 1.0 | 45.0 | 1.31 | 10.91 |
| Auditions 5 | 11 May | 10.24 | 1.0 | 45.2 | 1.71 | 11.95 |
| Auditions 6 | 18 May | 9.11 | 1.0 | 38.1 | 1.25 | 10.36 |
| Auditions 7 | 26 May | 8.09 | 3.0 | 38.0 | 1.13 | 9.22 |
| Semi-final 1 | 27 May | 9.52 | 1.0 | 41.5 | 1.46 | 10.98 |
| Semi-final 1 results | 27 May | 7.60 | 10.0 | 31.4 | 1.14 | 8.74 |
| Semi-final 2 | 28 May | 8.54 | 6.0 | 36.5 | 1.21 | 9.75 |
| Semi-final 2 results | 28 May | 7.13 | 14.0 | 28.5 | N/A | 7.13 |
| Semi-final 3 | 30 May | 8.17 | 8.0 | 37.5 | 1.27 | 9.44 |
| Semi-final 3 results | 30 May | 7.18 | 13.0 | 32.3 | N/A | 7.18 |
| Semi-final 4 | 31 May | 8.28 | 7.0 | 37.5 | 1.12 | 9.40 |
| Semi-final 4 results | 31 May | 7.29 | 12.0 | 32.7 | N/A | 7.29 |
| Semi-final 5 | 1 June | 8.02 | 9.0 | 41.9 | 1.20 | 9.22 |
| Semi-final 5 results | 1 June | 7.46 | 11.0 | 32.8 | 1.07 | 8.53 |
| Live final | 8 June | 10.43 | 1.0 | 48.9 | 1.80 | 12.23 |
Question:
What date was the show's weekly ranking 12?
Answer:
31 May