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 | Opponent | Score | Loss | Attendance | Record |
| --- | --- | --- | --- | --- | --- |
| September 1 | Giants | 4–0 | Sánchez (8–10) | 31388.0 | 65–74 |
| September 2 | Giants | 6–5 (12) | Yabu (3–6) | 23710.0 | 66–74 |
| September 3 | Giants | 9–2 | Cook (16–9) | 23481.0 | 66–75 |
| September 5 | Astros | 5–3 | Moehler (10–6) | 26163.0 | 67–75 |
| September 6 | Astros | 2–0 | Francis (4–9) | 32352.0 | 67–76 |
| September 7 | Astros | 7–5 | Buchholz (6–5) | 30509.0 | 67–77 |
| September 9 | @ Braves | 5–4 (10) | Buchholz (6–6) | 21821.0 | 67–78 |
| September 10 | @ Braves | 9–5 | Vizcaíno (1–1) | 19693.0 | 67–79 |
| September 11 | @ Braves | 8–4 | Rusch (5–5) | 20039.0 | 67–80 |
| September 12 | Dodgers | 7–2 | Francis (4–10) | 30147.0 | 67–81 |
| September 13 | Dodgers | 5–1 | De La Rosa (8–8) | 40291.0 | 67–82 |
| September 14 | Dodgers | 1–0 (10) | Kuo (5–3) | 28910.0 | 68–82 |
| September 15 | Padres | 11–5 | Reynolds (2–7) | 25296.0 | 68–83 |
| September 16 | Padres | 10–3 | Estes (2–3) | 25507.0 | 69–83 |
| September 17 | Padres | 1–0 | Geer (2–1) | 25155.0 | 70–83 |
| September 19 | Diamondbacks | 3–2 | Scherzer (0–3) | 43137.0 | 71–83 |
| September 20 | Diamondbacks | 5–3 | Fuentes (1–5) | 38283.0 | 71–84 |
| September 21 | Diamondbacks | 13–4 | Reynolds (2–8) | 32915.0 | 71–85 |
| September 23 | @ Giants | 9–4 | Lincecum (17–5) | 33922.0 | 72–85 |
| September 24 | @ Giants | 15–6 | Sánchez (9–12) | 31942.0 | 73–85 |
| September 25 | @ Giants | 3–1 | Zito (10–17) | 31857.0 | 74–85 |
| September 26 | @ Diamondbacks | 6–4 | Grilli (3–2) | 34590.0 | 74–86 |
| September 27 | @ Diamondbacks | 6–4 | Corpas (3–4) | 33234.0 | 74–87 |
| September 28 | @ Diamondbacks | 2–1 | Vizcaíno (1–2) | 35908.0 | 74–88 |
Question:
Loss of de la rosa (8–8) has what average attendance?
Answer:
40291.0