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:
| Finish | Start | Car no. | Driver | Owner/Sponsor | Car make |
| --- | --- | --- | --- | --- | --- |
| 1.0 | 2.0 | 21.0 | A.J. Foyt | Purolator ( Wood Brothers ) | '71 Mercury |
| 2.0 | 6.0 | 6.0 | Charlie Glotzbach | American Brakeblok / Signal Stat ( Cotton Owens ) | '71 Dodge |
| 3.0 | 8.0 | 31.0 | Jim Vandiver | O.L. Nixon | 70 Dodge |
| 4.0 | 33.0 | 72.0 | Benny Parsons | L.G. DeWitt | '70 Mercury |
| 5.0 | 35.0 | 48.0 | James Hylton | Pop Kola ( James Hylton ) | '71 Ford |
| 6.0 | 16.0 | 3.0 | Cale Yarborough | Ray Fox | '71 Plymouth |
| 7.0 | 23.0 | 5.0 | David Sisco | Charlie McGee | '72 Chevrolet |
| 8.0 | 21.0 | 25.0 | Jabe Thomas | Don Robertson | '70 Plymouth |
| 9.0 | 15.0 | 4.0 | John Sears | J. Marvin Mills Heating & Air ( J. Marvin Mills ) | '70 Plymouth |
| 10.0 | 13.0 | 23.0 | Vic Elford | Don Robertson | '70 Plymouth |
| 11.0 | 26.0 | 3.0 | Tommy Gale | Frank Vasko | '71 Mercury |
| 12.0 | 38.0 | 64.0 | Elmo Langley | Elmo Langley | '71 Ford |
| 13.0 | 5.0 | 91.0 | Richard D. Brown | Ralph McNabb | '72 Chevrolet |
| 14.0 | 37.0 | 19.0 | Henley Gray | Henley Gray | '71 Ford |
| 15.0 | 34.0 | 0.0 | George Altheide | George Altheide | '70 Dodge |
| 16.0 | 4.0 | 12.0 | Bobby Allison | Coca-Cola ( Richard Howard ) | '72 Chevrolet |
| 17.0 | 20.0 | 76.0 | Ben Arnold | Ben Arnold | '71 Ford |
| 18.0 | 7.0 | 79.0 | Frank Warren | Frank Warren | '70 Dodge |
| 19.0 | 25.0 | 57.0 | David Ray Boggs | David Ray Boggs | '70 Dodge |
| 20.0 | 27.0 | 86.0 | Ed Hessert | Neil Castles | '70 Dodge |
| 21.0 | 30.0 | 44.0 | Larry Dickson | Giachetti Brothers ( Richard Giachetti ) | '71 Ford |
| 22.0 | 9.0 | 56.0 | Jim Hurtubise | Richard Hammond | '70 Chevrolet |
| 23.0 | 14.0 | 90.0 | Bill Dennis | Junie Donlavey | '72 Ford |
| 24.0 | 19.0 | 70.0 | J.D. McDuffie | J.D. McDuffie | '71 Chevrolet |
| 25.0 | 3.0 | 14.0 | Coo Coo Marlin | Cunningham-Kelley ( H.B. Cunningham ) | '72 Chevrolet |
| 26.0 | 32.0 | 43.0 | Richard Petty | STP ( Petty Enterprises ) | '72 Plymouth |
| 27.0 | 12.0 | 2.0 | Dave Marcis | Dave Marcis | '72 Dodge |
| 28.0 | 28.0 | 88.0 | Ron Keselowski | Roger Lubinski | '70 Dodge |
| 29.0 | 36.0 | 45.0 | Bill Seifert | Bill Seifert | '71 Ford |
| 30.0 | 18.0 | 97.0 | Red Farmer | Willie Humphries | '72 Ford |
| 31.0 | 17.0 | 61.0 | Jimmy Finger | Bierschwale-Haverlah ( Don Bierschwale ) | '71 Ford |
| 32.0 | 22.0 | 67.0 | Buddy Arrington | Buddy Arrington | '70 Plymouth |
| 33.0 | 1.0 | 71.0 | Bobby Isaac | K & K Insurance ( Nord Krauskopf ) | '72 Dodge |
| 34.0 | 31.0 | 11.0 | Buddy Baker | STP ( Petty Enterprises ) | '72 Dodge |
| 35.0 | 10.0 | 16.0 | Mark Donohue | American Motors ( Roger Penske ) | '72 Matador |
| 36.0 | 29.0 | 30.0 | Walter Ballard | Ballard Racing ( Vic Ballard ) | '71 Ford |
| 37.0 | 24.0 | 9.0 | Ramo Stott | Housby Racing ( Jack Housby ) | '72 Dodge |
| 38.0 | 39.0 | 10.0 | Bill Champion | Bill Champion | '71 Ford |
| 39.0 | 11.0 | 24.0 | Cecil Gordon | Cecil Gordon | 71 Mercury |
Question:
Name the least finish for larry dickson
Answer:
21.0