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:
| Rank by average | Place | Couple | Total points | Number of dances | Average |
| --- | --- | --- | --- | --- | --- |
| 1.0 | 2.0 | Gilles & Cheryl | 449.0 | 16.0 | 28.1 |
| 2.0 | 1.0 | Shawn & Mark | 431.0 | 16.0 | 26.9 |
| 3.0 | 3.0 | Melissa & Tony | 430.0 | 16.0 | 26.9 |
| 4.0 | 5.0 | Lil' Kim & Derek | 284.0 | 11.0 | 25.3 |
| 5.0 | 6.0 | Chuck & Julianne | 209.0 | 9.0 | 23.3 |
| 6.0 | 4.0 | Ty & Chelsie | 289.0 | 13.0 | 22.2 |
| 7.0 | 9.0 | David & Kym | 104.0 | 5.0 | 20.8 |
| 8.0 | 7.0 | Lawrence & Edyta | 138.0 | 7.0 | 19.7 |
| 9.0 | 12.0 | Denise & Maksim | 55.0 | 3.0 | 18.3 |
| 10.0 | 13.0 | Belinda & Jonathan | 35.0 | 2.0 | 17.5 |
| 11.0 | 11.0 | Holly & Dmitry | 69.0 | 4.0 | 17.2 |
| 12.0 | 8.0 | Steve-O & Lacey | 95.0 | 6.0 | 15.8 |
Question:
What's the highest number a couple has ranked at?
Answer:
13.0