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:
| Week | Date | Opponent | Result | Game site | Record | Attendance |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | September 6 | Oakland Raiders | W 9–7 | Mile High Stadium | 1–0 | 74796.0 |
| 2.0 | September 13 | at Seattle Seahawks | L 10–13 | Kingdome | 1–1 | 58513.0 |
| 3.0 | September 20 | Baltimore Colts | W 28–10 | Mile High Stadium | 2–1 | 74804.0 |
| 4.0 | September 27 | San Diego Chargers | W 42–24 | Mile High Stadium | 3–1 | 74822.0 |
| 5.0 | October 4 | at Oakland Raiders | W 17–0 | Oakland-Alameda County Coliseum | 4–1 | 51035.0 |
| 6.0 | October 11 | Detroit Lions | W 27–21 | Mile High Stadium | 5–1 | 74816.0 |
| 7.0 | October 18 | at Kansas City Chiefs | L 14–28 | Arrowhead Stadium | 5–2 | 74672.0 |
| 8.0 | October 25 | at Buffalo Bills | L 7–9 | Rich Stadium | 5–3 | 77757.0 |
| 9.0 | November 2 | Minnesota Vikings | W 19–17 | Mile High Stadium | 6–3 | 74834.0 |
| 10.0 | November 8 | Cleveland Browns | W 23–20 (OT) | Mile High Stadium | 7–3 | 74859.0 |
| 11.0 | November 15 | at Tampa Bay Buccaneers | W 24–7 | Tampa Stadium | 8–3 | 64518.0 |
| 12.0 | November 22 | at Cincinnati Bengals | L 21–38 | Riverfront Stadium | 8–4 | 57207.0 |
| 13.0 | November 29 | at San Diego Chargers | L 17–34 | Jack Murphy Stadium | 8–5 | 51533.0 |
| 14.0 | December 6 | Kansas City Chiefs | W 16–13 | Mile High Stadium | 9–5 | 74744.0 |
| 15.0 | December 13 | Seattle Seahawks | W 23–13 | Mile High Stadium | 10–5 | 74527.0 |
Question:
Where is riverfront stadium the game site for the week?
Answer:
12.0