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:
| Episode | Air Date | Timeslot | Rating | Share | 18–49 (Rating/Share) | Viewers (m) | Rank (#) |
| --- | --- | --- | --- | --- | --- | --- | --- |
| " A New Hope " | March 3, 2009 | Tuesday 8/7c | 8.5 | 9 | 0.9/2 | 2.35 | TBA |
| " Dirty Sexy Mongol " | March 10, 2009 | Tuesday 8/7c | 1.4 | 2 | 0.8/2 | 2.17 | 90 |
| " The Sweet Science " | March 17, 2009 | Tuesday 8/7c | 1.2 | 2 | 0.9/3 | 1.88 | TBA |
| " The Favorite " | March 24, 2009 | Tuesday 8/7c | 9.5 | 2 | 1.0/3 | 2.47 | TBA |
| " I Want My Baby Back " | March 31, 2009 | Tuesday 8/7c | 10.0 | 3 | 1.0/3 | 2.37 | TBA |
| " Underbelly " | April 7, 2009 | Tuesday 8/7c | 0.9 | 2 | 0.8/3 | 2.28 | TBA |
| " The Good Soil " | April 14, 2009 | Tuesday 8/7c | 0.9 | 3 | 0.9/2 | 2.05 | TBA |
| " The Home Stretch " | April 21, 2009 | Tuesday 8/7c | 1.0 | 3 | 0.9/3 | 2.45 | TBA |
| " No Reaper Left Behind " | April 28, 2009 | Tuesday 8/7c | 0.7 | 2 | 0.6/2 | 1.82 | TBA |
| " My Brother's Reaper " | May 5, 2009 | Tuesday 8/7c | 1.2 | 2 | 0.8/2 | 2.22 | TBA |
| " To Sprong, With Love " | May 12, 2009 | Tuesday 8/7c | 1.33 | 2 | 0.9/3 | 1.99 | TBA |
| " Business Casualty " | May 19, 2009 | Tuesday 8/7c | TBA | TBA | TBA | 1.79 | TBA |
| " The Devil & Sam Oliver " | May 26, 2009 | Tuesday 8/7c | TBA | TBA | TBA | 2.22 | TBA |
Question:
What is the rating of the show ranked tba, aired on April 21, 2009?
Answer:
1.0