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:
| Game | December | Opponent | Score | Record | Points |
| --- | --- | --- | --- | --- | --- |
| 26.0 | 4.0 | Chicago Black Hawks | 5–2 | 17–3–6 | 40.0 |
| 27.0 | 6.0 | @ St. Louis Blues | 2–7 | 17–4–6 | 40.0 |
| 28.0 | 7.0 | Minnesota North Stars | 6–1 | 18–4–6 | 42.0 |
| 29.0 | 10.0 | @ California Golden Seals | 1–1 | 18–4–7 | 43.0 |
| 30.0 | 13.0 | @ Los Angeles Kings | 6–4 | 19–4–7 | 45.0 |
| 31.0 | 17.0 | @ Chicago Black Hawks | 4–2 | 20–4–7 | 47.0 |
| 32.0 | 19.0 | @ Washington Capitals | 7–5 | 21–4–7 | 49.0 |
| 33.0 | 21.0 | St. Louis Blues | 8–3 | 22–4–7 | 51.0 |
| 34.0 | 23.0 | @ Atlanta Flames | 2–2 | 22–4–8 | 52.0 |
| 35.0 | 28.0 | Boston Bruins | 2–4 | 22–5–8 | 52.0 |
| 36.0 | 30.0 | @ New York Islanders | 2–6 | 22–6–8 | 52.0 |
Question:
After December 19, what is the Game number with a Record of 21–4–7?
Answer:
0.0