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. in series | No. in season | Title | Directed by | Written by | Original air date | U.S. viewers (millions) |
| --- | --- | --- | --- | --- | --- | --- |
| 73.0 | 1.0 | "From the Grave" | Karen Gaviola | Ann Donahue & Elizabeth Devine | September19,2005 | 19.21 |
| 74.0 | 2.0 | "Blood in the Water" | Duane Clark | Dean Widenmann & Sunil Nayar | September26,2005 | 17.38 |
| 75.0 | 3.0 | "Prey" | Scott Lautanen | Corey Miller & Barry O'Brien | October3,2005 | 18.67 |
| 76.0 | 4.0 | "48 Hours to Life" | Norberto Barba | John Haynes & Marc Dube | October10,2005 | 18.49 |
| 77.0 | 5.0 | "Three-Way" | Jonathan Glassner | Marc Guggenheim & Ildy Modrovich | October17,2005 | 17.91 |
| 78.0 | 6.0 | "Under Suspicion" | Sam Hill | Sunil Nayar & Barry O'Brien | October24,2005 | 19.94 |
| 79.0 | 7.0 | "Felony Flight" | Scott Lautanen | Elizabeth Devine & Anthony E. Zuiker & Ann Donahue | November7,2005 | 18.39 |
| 80.0 | 8.0 | "Nailed" | Karen Gaviola | Corey Miller & Barry O'Brien | November14,2005 | 19.36 |
| 81.0 | 9.0 | "Urban Hellraisers" | Matt Earl Beesley | Dean Widenmann & Marc Guggenheim | November21,2005 | 19.36 |
| 82.0 | 10.0 | "Shattered" | Scott Lautanen | Ildy Modrovich | November28,2005 | 19.77 |
| 83.0 | 11.0 | "Payback" | Sam Hill | Marc Dube & Ildy Modrovich & Marc Guggenheim | December19,2005 | 20.33 |
| 84.0 | 12.0 | "The Score" | Jonathan Glassner | Barry O'Brien | January9,2006 | 20.15 |
| 85.0 | 13.0 | "Silencer" | Ernest R. Dickerson | Sunil Nayar | January23,2006 | 19.69 |
| 86.0 | 14.0 | "Fade Out" | Scott Lautanen | Corey Miller | January30,2006 | 20.43 |
| 87.0 | 15.0 | "Skeletons" | Karen Gaviola | John Haynes & Elizabeth Devine | February6,2006 | 18.68 |
| 88.0 | 16.0 | "Deviant" | Scott Lautanen | Krystal Houghton | February27,2006 | 18.43 |
| 89.0 | 17.0 | "Collision" | Sam Hill | Dean Widenmann | March6,2006 | 18.61 |
| 90.0 | 18.0 | "Double Jeopardy" | Scott Lautanen | Brian Davidson | March13,2006 | 19.01 |
| 91.0 | 19.0 | "Driven" | Eagle Egilsson | Ildy Modrovich | March20,2006 | 19.86 |
| 92.0 | 20.0 | "Free Fall" | Scott Lautanen | Marc Dube | April10,2006 | 17.16 |
| 93.0 | 21.0 | "Dead Air" | Sam Hill | John Haynes | April24,2006 | 18.74 |
| 94.0 | 22.0 | "Open Water" | Scott Lautanen | Marc Dube & Ildy Modrovich | May1,2006 | 19.31 |
| 95.0 | 23.0 | "Shock" (Part 1) | Karen Gaviola | Brian Davidson & Corey Miller | May8,2006 | 19.96 |
Question:
How many millions of U.S. viewers whatched episodes written by Krystal Houghton?
Answer:
18.43