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) |
| --- | --- | --- | --- | --- | --- | --- |
| 47.0 | 1.0 | "Revenge Is Best Served Cold" | Danny Cannon | Carol Mendelsohn & Anthony E. Zuiker | September26,2002 | 30.47 |
| 48.0 | 2.0 | "The Accused Is Entitled" | Kenneth Fink | Elizabeth Devine & Ann Donahue | October3,2002 | 28.46 |
| 49.0 | 3.0 | "Let the Seller Beware" | Richard J. Lewis | Andrew Lipsitz & Anthony E. Zuiker | October10,2002 | 29.90 |
| 50.0 | 4.0 | "A Little Murder" | Tucker Gates | Ann Donahue & Naren Shankar | October17,2002 | 30.81 |
| 51.0 | 5.0 | "Abra-Cadaver" | Danny Cannon | Danny Cannon & Anthony E. Zuiker | October31,2002 | 28.95 |
| 52.0 | 6.0 | "The Execution of Catherine Willows" | Kenneth Fink | Elizabeth Devine & Carol Mendelsohn | November7,2002 | 27.86 |
| 53.0 | 7.0 | "Fight Night" | Richard J. Lewis | Andrew Lipsitz & Naren Shankar | November14,2002 | 29.94 |
| 54.0 | 8.0 | "Snuff" | Kenneth Fink | Ann Donahue & Bob Harris | November21,2002 | 25.97 |
| 55.0 | 9.0 | "Blood Lust" | Charlie Correll | Josh Berman & Carol Mendelsohn | December5,2002 | 29.74 |
| 56.0 | 10.0 | "High and Low" | Richard J. Lewis | Naren Shankar & Eli Talbert | December12,2002 | 25.89 |
| 57.0 | 11.0 | "Recipe for Murder" | Richard J. Lewis & J. Miller Tobin | Ann Donahue & Anthony E. Zuiker | January9,2003 | 25.48 |
| 58.0 | 12.0 | "Got Murder?" | Kenneth Fink | Sarah Goldfinger | January16,2003 | 27.87 |
| 59.0 | 13.0 | "Random Acts of Violence" | Danny Cannon | Danny Cannon & Naren Shankar | January30,2003 | 27.48 |
| 60.0 | 14.0 | "One Hit Wonder" | Félix Enríquez Alcalá | Corey Miller | February6,2003 | 25.60 |
| 62.0 | 16.0 | "Lucky Strike" | Kenneth Fink | Eli Talbert & Anthony E. Zuiker | February20,2003 | 27.95 |
| 63.0 | 17.0 | "Crash and Burn" | Richard J. Lewis | Josh Berman | March13,2003 | 28.60 |
| 64.0 | 18.0 | "Precious Metal" | Deran Sarafian | Andrew Lipsitz & Naren Shankar | April3,2003 | 26.37 |
| 67.0 | 21.0 | "Forever" | David Grossman | Sarah Goldfinger | May1,2003 | 22.66 |
| 68.0 | 22.0 | "Play with Fire" | Kenneth Fink | Andrew Lipsitz & Naren Shankar | May8,2003 | 25.10 |
Question:
What's the highest season number of an episode in the series?
Answer:
22.0