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 |
| --- | --- | --- | --- | --- | --- |
| Nov 28, 1971 | Sea Pines Heritage Classic | 68-73-68-70=279 | −5 | 1 stroke | Bob Lunn |
| Sep 16, 1973 | Sea Pines Heritage Classic | 69-66-65-72=272 | −12 | 5 strokes | Jerry Heard , Grier Jones |
| Jun 16, 1974 | U.S. Open | 73-70-71-73=287 | +7 | 2 strokes | Forrest Fezler |
| Jun 1, 1975 | Atlanta Classic | 66-69-68-68=271 | −17 | 4 strokes | Tom Watson |
| Jun 29, 1975 | Western Open | 71-68-71-73=283 | −1 | 1 stroke | Bobby Cole |
| Feb 22, 1976 | Glen Campbell-Los Angeles Open | 69-69-66-68=272 | −12 | 2 strokes | Tom Watson |
| Mar 7, 1976 | Florida Citrus Open | 74-66-64-66=270 | −18 | Playoff | Kermit Zarley |
| May 29, 1977 | Atlanta Classic | 70-70-66-67=273 | −15 | 1 stroke | Steve Veriato |
| 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 |
| May 26, 1985 | Memorial Tournament | 72-67-68-67=274 | −14 | 1 stroke | Lanny Wadkins |
| Jun 18, 1990 | U.S. Open | 69-70-74-67=280 | −8 | Playoff | Mike Donald |
| Jun 24, 1990 | Buick Classic | 66-69-68-66=269 | −15 | 2 strokes | Paul Azinger |
| Apr 17, 1994 | MCI Heritage Golf Classic | 68-65-65-68=266 | −18 | 1 stroke | Greg Norman |
Question:
When the Winning score is 74-68-67-75=284, what was the Margin of victory?
Answer:
2 strokes