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 season | No. in series | Title | Canadian airdate | US airdate | Production code |
| --- | --- | --- | --- | --- | --- |
| 1.0 | 144.0 | "Uptown Girl" Part One | 5 October 2008 | 10 October 2008 | 801.0 |
| 2.0 | 145.0 | "Uptown Girl" Part Two | 12 October 2008 | 10 October 2008 | 802.0 |
| 3.0 | 146.0 | "Fight the Power" | 19 October 2008 | 17 October 2008 | 803.0 |
| 4.0 | 147.0 | "Didn't We Almost Have It All" | 2 November 2008 | 24 October 2008 | 804.0 |
| 5.0 | 148.0 | "Man with Two Hearts" | 9 November 2008 | 7 November 2008 | 805.0 |
| 6.0 | 149.0 | "With or Without You" | 16 November 2008 | 14 November 2008 | 806.0 |
| 7.0 | 150.0 | "Money for Nothing" | 23 November 2008 | 21 November 2008 | 807.0 |
| 8.0 | 151.0 | "Lost in Love" Part One | 30 November 2008 | 13 February 2009 | 808.0 |
| 9.0 | 152.0 | "Lost in Love" Part Two | 18 January 2009 | 13 February 2009 | 809.0 |
| 10.0 | 153.0 | "Bad Medicine" | 25 January 2009 | 20 February 2009 | 810.0 |
| 11.0 | 154.0 | "Causing a Commotion" | 8 February 2009 | 27 February 2009 | 811.0 |
| 12.0 | 155.0 | "Heat of the Moment" | 15 February 2009 | 6 March 2009 | 812.0 |
| 13.0 | 156.0 | "Jane Says" Part One | 1 March 2009 | 3 July 2009 | 813.0 |
| 14.0 | 157.0 | "Jane Says" Part Two | 8 March 2009 | 3 July 2009 | 814.0 |
| 15.0 | 158.0 | "Touch of Grey" | 15 March 2009 | 10 July 2009 | 815.0 |
| 16.0 | 159.0 | "Heart of Glass" | 22 March 2009 | 17 July 2009 | 816.0 |
| 17.0 | 160.0 | "Up Where We Belong" | 5 April 2009 | 24 July 2009 | 817.0 |
Question:
How many U.S. air dates were from an episode in Season 4?
Answer:
1.0