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 | Round | Attendance | Opposition | Stadium |
| --- | --- | --- | --- | --- |
| 26 August 2007 | Round 1 | 14,421 | Melbourne Victory | Westpac Stadium |
| 9 September 2007 | Round 3 | 11,478 | Newcastle Jets | Westpac Stadium |
| 22 September 2007 | Round 5 | 12,127 | Adelaide United | Westpac Stadium |
| 30 September 2007 | Round 6 | 10,127 | Perth Glory | Westpac Stadium |
| 21 October 2007 | Round 9 | 10,560 | Central Coast Mariners | Westpac Stadium |
| 17 November 2007 | Round 13 | 8,062 | Sydney FC | Westpac Stadium |
| 30 November 2007 | Round 15 | 18,345 | Adelaide United | Westpac Stadium |
| 1 December 2007 | Exhibition | 31,853 | Los Angeles Galaxy | Westpac Stadium |
| 7 December 2007 | Round 16 | 8,032 | Perth Glory | Westpac Stadium |
| 14 December 2007 | Round 17 | 9,384 | Queensland Roar | Westpac Stadium |
| 4 January 2008 | Round 19 | 14,288 | Sydney FC | Westpac Stadium |
| Total | 116,824 excl. exhibition match | 116,824 excl. exhibition match | 116,824 excl. exhibition match | 116,824 excl. exhibition match |
| Average | 11,682 excl. exhibition match | 11,682 excl. exhibition match | 11,682 excl. exhibition match | 11,682 excl. exhibition match |
Question:
What round was adelaide united the opposition with an attendance of 18,345?
Answer:
Round 15