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:
| No. | # | Title | Directed by | Written by | U.S. air date | Production code | U.S. viewers (million) |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 175.0 | 1.0 | "Savior" | Kevin G. Fair | Kelly Souders & Brian Peterson | September25,2009 | 3X5251 | 2.58 |
| 176.0 | 2.0 | "Metallo" | Mairzee Almas | Don Whitehead & Holly Henderson | October2,2009 | 3X5252 | 2.24 |
| 177.0 | 3.0 | "Rabid" | Michael Rohl | Jordan Hawley | October9,2009 | 3X5253 | 2.30 |
| 178.0 | 4.0 | "Echo" | Wayne Rose | Bryan Miller | October16,2009 | 3X5254 | 2.61 |
| 179.0 | 5.0 | "Roulette" | Kevin G. Fair | Genevieve Sparling | October23,2009 | 3X5256 | 2.52 |
| 180.0 | 6.0 | "Crossfire" | Michael Rohl | Don Whitehead & Holly Henderson | October30,2009 | 3X5257 | 2.57 |
| 181.0 | 7.0 | "Kandor" | Jeannot Szwarc | Al Septien & Turi Meyer | November6,2009 | 3X5258 | 2.63 |
| 182.0 | 8.0 | "Idol" | Glen Winter | Anne Cofell Saunders | November13,2009 | 3X5255 | 2.68 |
| 183.0 | 9.0 | "Pandora" | Morgan Beggs | Drew Landis & Julia Swift | November20,2009 | 3X5259 | 2.45 |
| 184.0 | 10.0 | "Disciple" | Mairzee Almas | Jordan Hawley | January29,2010 | 3X5260 | 2.52 |
| 185.0 | 11.0 | " Absolute Justice " | Glen Winter (1st Hour) Tom Welling (2nd Hour) | Geoff Johns | February5,2010 | 3X5262/3X5263 | 2.77 |
| 186.0 | 12.0 | "Warrior" | Allison Mack | Bryan Miller | February12,2010 | 3X5261 | 2.48 |
| 187.0 | 13.0 | "Persuasion" | Christopher Petry | Anne Cofell Saunders | February19,2010 | 3X5264 | 2.42 |
| 188.0 | 14.0 | "Conspiracy" | Turi Meyer | Al Septien & Turi Meyer | February26,2010 | 3X5265 | 2.53 |
| 189.0 | 15.0 | "Escape" | Kevin G. Fair | Genevieve Sparling | April2,2010 | 3X5266 | 2.13 |
| 190.0 | 16.0 | "Checkmate" | Tim Scanlan | John Chisholm | April9,2010 | 3X5267 | 2.13 |
| 191.0 | 17.0 | "Upgrade" | Michael Rohl | Drew Landis & Julia Swift | April16,2010 | 3X5268 | 1.84 |
| 192.0 | 18.0 | "Charade" | Brian Peterson | Don Whitehead & Holly Henderson | April23,2010 | 3X5269 | 2.23 |
| 193.0 | 19.0 | "Sacrifice" | Kevin G. Fair | Justin Hartley , Bryan Miller & Walter Wong | April30,2010 | 3X5270 | 1.89 |
| 194.0 | 20.0 | "Hostage" | Glen Winter | Jordan Hawley & Anne Cofell Saunders | May7,2010 | 3X5271 | 1.92 |
Question:
What's the number of the episode seen by 2.24 million people in the US?
Answer:
2.0