Table:
text: Hale Irwin
PGA Tour wins (20)
PGA Tour wins (20)
Date_ Tournament Winning_score To_par Margin_of_victory Runners_up
Aug 28, 1977 Colgate Hall of Fame Golf Classic 65-62-69-68=264 −20 5 strokes Leonard Thompson
Oct 16, 1977 San Antonio Texas Open 68-67-64-67=266 −14 2 strokes Miller Barber
Jun 17, 1979 U.S. Open 74-68-67-75=284 Even 2 strokes Jerry Pate , Gary Player
Feb 14, 1981 Hawaiian Open 68-66-62-69=265 −23 6 strokes Don January
Aug 23, 1981 Buick Open 65-73-67-72=277 −11 Playoff Bobby Clampett , Peter Jacobsen , Gil Morgan
Mar 14, 1982 Honda Inverrary Classic 65-71-67-66=269 −19 1 stroke George Burns , Tom Kite
May 29, 1983 Memorial Tournament 71-71-70-69=281 −7 1 stroke Ben Crenshaw , David Graham
Feb 5, 1984 Bing Crosby National Pro-Am 69-69-68-72=278 −10 Playoff Jim Nelford

Question: If the winning score is 74-68-67-75=284 in Hale Irwin's PGA Tour wins 20, what is the winning margin?

Question: If the win is 71-71-70-69=281, what is the top par Hale Irwin's PGA Tour wins (20)?