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 | Margin of victory | Runner(s)-up |
| --- | --- | --- | --- | --- |
| Feb 11, 1968 | Andy Williams-San Diego Open Invitational | –15 (66-68-71-68=273) | 1 stroke | Al Geiberger |
| Jul 7, 1968 | Buick Open Invitational | –8 (73-67-71-69=280) | 1 stroke | Mike Hill |
| Jun 13, 1971 | Kemper Open | –11 (66-72-70-69=277) | Playoff | Dale Douglass , Gary Player , Lee Trevino |
| Aug 22, 1971 | IVB-Philadelphia Golf Classic | –14 (67-71-66-70=274) | 1 stroke | Dave Hill |
| Feb 27, 1972 | Jackie Gleason's Inverrary Classic | –10 (69-72-69-68=278) | 1 stroke | Jack Nicklaus |
| May 13, 1973 | Colonial National Invitation | –4 (69-68-70-69=276) | 1 stroke | Bruce Crampton , Jerry Heard |
| Jun 3, 1973 | Kemper Open | –17 (65-70-68-68=271) | 3 strokes | Lanny Wadkins |
| Jun 10, 1973 | IVB-Philadelphia Golf Classic | –14 (67-71-65-71=274) | 4 strokes | Jim Barber |
| Jul 14, 1973 | The Open Championship | –12 (68-67-71-70=276) | 3 strokes | Neil Coles , Johnny Miller |
| Jul 29, 1973 | Canadian Open | –10 (67-73-68-70=278) | 2 strokes | Forrest Fezler |
| Apr 6, 1975 | Greater Greensboro Open | –9 (64-71-72-68=275) | 3 strokes | Al Geiberger |
| Jul 27, 1975 | Canadian Open | –6 (65-74-68-67=274) | Playoff | Jack Nicklaus |
| Jun 5, 1977 | Kemper Open | –11 (67-71-69-70=277) | 2 strokes | George Burns , Bill Rogers |
| Mar 12, 1978 | Doral-Eastern Open | –16 (67-70-67-68=272) | 1 stroke | Jack Nicklaus |
| Sep 20, 1981 | LaJet Classic | –10 (73-67-70-68=278) | 2 strokes | Gil Morgan |
| Jul 4, 1982 | Western Open | –12 (69-67-70-70=276) | 1 stroke | Larry Nelson |
Question:
What was the winning score for the Andy Williams-San Diego Open Invitational tournament?
Answer:
–15 (66-68-71-68=273)