Table:
text: David Toms
PGA Tour wins (13)
PGA Tour wins (13)
Date_ Tournament Winning_score Margin_of_victory Runners_up
Jul 13, 1997 Quad City Classic –15 (67-66-67-65=265) 3 strokes Brandel Chamblee
Aug 22, 1999 Sprint International 47 pts. (16-13-10-8=47) 3 points David Duval
Oct 3, 1999 Buick Challenge –17 (68-66-66-71=271) 3 strokes Stuart Appleby
Oct 8, 2000 Michelob Championship at Kingsmill –13 (68-70-67-66=271) Playoff Mike Weir
May 6, 2001 Compaq Classic of New Orleans –22 (66-63-64=266) 2 strokes Phil Mickelson
Aug 19, 2001 PGA Championship –15 (66-65-65-69=265) 1 stroke Phil Mickelson
Oct 7, 2001 Michelob Championship at Kingsmill –15 (64-70-67-68=269) 1 stroke Kirk Triplett
May 11, 2003 Wachovia Championship –10 (70-69-66-73=278) 2 strokes Robert Gamez

Question: What is the PGA Tour wins margin (13) David Toms under PGA Championship?