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 | Tournament | Winning score | To par | Margin of victory | Runner(s)-up |
| --- | --- | --- | --- | --- | --- |
| 2 Nov 2002 | Southern Farm Bureau Classic * | 66-67-68=201 | −15 | 1 stroke | Deane Pappas |
| 12 Mar 2006 | Honda Classic | 72-67-68-69=276 | −12 | 2 strokes | Geoff Ogilvy |
| 27 Feb 2011 | WGC-Accenture Match Play Championship | 3 and 2 | 3 and 2 | 3 and 2 | Martin Kaymer |
| 23 Oct 2011 | Children's Miracle Network Hospitals Classic | 66-71-70-64=271 | −17 | 2 strokes | Justin Leonard |
| 18 Mar 2012 | Transitions Championship | 67-68-70-66=271 | −13 | Playoff | Bae Sang-moon , Jim Furyk , Robert Garrigus |
Question:
What is the to par when the winning score was 67-68-70-66=271?
Answer:
−13