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:
| Season | Episodes | Timeslot (ET) | Season Premiere | Season Finale | TV Season | Rank | Viewers (in millions) |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1.0 | 10.0 | Saturday 8:00 PM | February 21, 2004 | August 14, 2004 | 2003-2004 | #123 | 6.21 |
| 2.0 | 17.0 | Saturday 8:00 PM | September 25, 2004 | August 27, 2005 | 2004-2005 | #107 | 6.41 |
| 3.0 | 25.0 | Saturday 8:00 PM | September 17, 2005 | August 12, 2006 | 2005-2006 | #126 | 5.74 |
| 4.0 | 25.0 | Saturday 8:00 PM | October 21, 2006 | August 25, 2007 | 2006-2007 | #180 | 5.12 |
| 5.0 | 23.0 | Saturday 8:00 PM | December 8, 2007 | August 23, 2008 | 2007-2008 | #160 | 4.69 |
| 6.0 | 21.0 | Saturday 8:00 PM | December 13, 2008 | August 29, 2009 | 2008-2009 | #149 | 3.80 |
| 7.0 | 18.0 | Saturday 8:00 PM | December 12, 2009 | August 28, 2010 | 2009-2010 | #119 | 3.55 |
| 8.0 | 22.0 | Saturday 8:00 PM | December 11, 2010 | August 20, 2011 | 2010-2011 | #170 | 3.53 |
| 9.0 | 14.0 | Saturday 8:00 PM | December 24, 2011 | August 18, 2012 | 2011-2012 | #156 | 3.46 |
Question:
How many rankings were there for the season with a finale on August 20, 2011?
Answer:
1.0