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. viewers (million) | Rank (week) | Original air date | Production code |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1.0 | "First Responders" | Davis Guggenheim | David Mamet | 18.50 | 10.0 | March7,2006 | 1ALF79 |
| 2.0 | "Stress" | Guy Ferland | David Mamet | 18.07 | 5.0 | March14,2006 | 1ALF01 |
| 3.0 | "200th Hour" | Steve Gomer | Sharon Lee Watson & Carol Flint | 15.50 | 10.0 | March21,2006 | 1ALF04 |
| 4.0 | "True Believers" | Oz Scott | Shawn Ryan & Eric L. Haney | 16.08 | 13.0 | March28,2006 | 1ALF02 |
| 5.0 | "Non-Permissive Environment" | Ron Lagomarsino | Lynn Mamet & Paul Redford | 15.44 | 10.0 | April4,2006 | 1ALF03 |
| 6.0 | "Security" | David Mamet | David Mamet | 14.12 | 12.0 | April11,2006 | 1ALF06 |
| 7.0 | "Dedication" | Helen Shaver | Paul Redford & Sharon Lee Watson | 15.62 | 10.0 | April18,2006 | 1ALF07 |
| 8.0 | "SERE" | Steven DePaul | Lynn Mamet & Carol Flint | 13.87 | 18.0 | April25,2006 | 1ALF08 |
| 9.0 | "Eating the Young" | J. Miller Tobin | Sterling Anderson | 14.06 | 18.0 | May2,2006 | 1ALF05 |
| 10.0 | "Unannounced" | Bill L. Norton | Paul Redford & Emily Halpern | 14.18 | 18.0 | May9,2006 | 1AFL09 |
| 11.0 | "Exposure" | Guy Norman Bee | Sharon Lee Watson & Dan Hindmarch | 12.33 | 26.0 | May9,2006 | 1ALF10 |
| 12.0 | "Morale, Welfare and Recreation" | Félix Enríquez Alcalá | Sterling Anderson & Paul Redford | 14.04 | 14.0 | May16,2006 | 1ALF11 |
Question:
What is the weeks rank for the episode with the production code 1alf05? 
Answer:
18.0