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:
| No. | Date | Tournament | Winning score | To par | Margin of victory | Runner(s)-up |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | 27 Sep 1992 | Piaget Belgian Open | 71-70-64-69=274 | −10 | 3 strokes | Barry Lane |
| 2.0 | 24 Jul 1994 | Heineken Dutch Open | 65-68-67-70=270 | −18 | 2 strokes | Howard Clark |
| 3.0 | 10 May 1998 | Turespana Masters Open Baleares | 69-68-70-72=279 | −9 | 2 strokes | Miguel Ángel Martín |
| 5.0 | 14 Mar 1999 | Turespana Masters - Open Andalucia | 69-66-62-67=264 | −24 | 4 strokes | Steve Webster |
| 7.0 | 19 Oct 2003 | Turespana Mallorca Classic | 72-67-65=204 | −9 | 1 stroke | José María Olazábal |
| 8.0 | 1 Feb 2004 | Johnnie Walker Classic 1 | 70-66-67-68=271 | −17 | 2 strokes | Thomas Bjørn , Jyoti Randhawa |
| 9.0 | 4 Apr 2004 | Algarve Open de Portugal | 69-66-70-67=272 | −16 | 2 strokes | Terry Price |
| 10.0 | 16 May 2004 | BMW Asian Open 1 | 71-66-70-67=274 | −14 | 3 strokes | Simon Dyson |
| 11.0 | 29 Aug 2004 | BMW International Open | 68-66-67-66=267 | −21 | 2 strokes | Thomas Levet |
| 12.0 | 5 Dec 2004 | Omega Hong Kong Open 1 | 65-64-71-66=266 | −14 | 1 stroke | Pádraig Harrington , James Kingston |
| 13.0 | 5 Jun 2005 | Celtic Manor Wales Open | 63-67-70-62=262 | −14 | 4 strokes | Martin Erlandsson , José Manuel Lara |
| 14.0 | 18 Nov 2007 | UBS Hong Kong Open 1 | 65-67-66-67=265 | −15 | 1 stroke | K.J. Choi , Robert Karlsson , Thongchai Jaidee |
| 15.0 | 25 May 2008 | BMW PGA Championship | 70-67-72-68=277 | −11 | Playoff | Oliver Wilson |
| 16.0 | 7 Feb 2010 | Omega Dubai Desert Classic | 70-67-68-72=277 | −11 | Playoff | Lee Westwood |
| 17.0 | 4 July 2010 | Alstom Open de France | 71-69-66-67=273 | −11 | Playoff | Alejandro Cañizares , Francesco Molinari |
| 18.0 | 5 Sep 2010 | Omega European Masters 1 | 67-61-68-67=263 | −21 | 3 strokes | Edoardo Molinari |
Question:
Name the margin of victory when the number is 15
Answer:
Playoff