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 | Title | Directed by | Written by | Original air date | Production code |
| --- | --- | --- | --- | --- | --- |
| 1.0 | "Pilot" | Richard Correll | William Bickley & Michael Warren | September 20, 1991 | 475049.0 |
| 2.0 | "The Dance" | Richard Correll | John B. Collins | September 27, 1991 | 447004.0 |
| 3.0 | "Rules of the House" | Richard Correll | Alan Eisenstock & Larry Mintz | October 4, 1991 | 447001.0 |
| 4.0 | "First Anniversary" | Richard Correll | Julia Newton | October 11, 1991 | 447003.0 |
| 5.0 | "Frank & Son" | Richard Correll | Howard Adler & Robert Griffard | October 18, 1991 | 447002.0 |
| 6.0 | "Pulling Together" | John Tracy | Ross Brown & Joe Fisch | October 25, 1991 | 447006.0 |
| 7.0 | "Yo-Yo's Wedding" | John Tracy | Meredith Siler | November 1, 1991 | 447005.0 |
| 8.0 | "Just for Kicks" | Larry Mintz | Alan Eisenstock | November 8, 1991 | 447009.0 |
| 9.0 | "Into the Woods" | Richard Correll | Ross Brown | November 15, 1991 | 447008.0 |
| 10.0 | "Mixed Messages" | James O'Keefe | Seth Weisbond | November 22, 1991 | 447010.0 |
| 11.0 | "A Day in the Life" | John Tracy | Howard Adler & Robert Griffard | November 29, 1991 | 447007.0 |
| 12.0 | "The New Car" | John Tracy | Julia Newton | December 6, 1991 | 447011.0 |
| 13.0 | "Getting Organized" | John Tracy | Howard Adler & Robert Griffard | December 13, 1991 | 447012.0 |
| 14.0 | "Home Alone" | John Tracy | John B. Collins | January 3, 1992 | 447013.0 |
| 15.0 | "Drive, He Said" | Richard Correll | Joe Fisch | January 17, 1992 | 447014.0 |
| 17.0 | "The Boys in the Band" | Richard Correll | Joe Fisch | February 14, 1992 | 447018.0 |
| 18.0 | "School Daze" | Richard Correll | Meredith Siler | February 21, 1992 | 447015.0 |
| 19.0 | "Country Club" | John Tracy | Alan Eisenstock & Larry Mintz | February 28, 1992 | 447019.0 |
| 20.0 | "Daddy's Girl" | Richard Correll | Howard Adler & Robert Griffard | March 6, 1992 | 447017.0 |
| 21.0 | "He Wanted Wings" | John Tracy | Joe Fisch | March 27, 1992 | 447021.0 |
Question:
What episode number in the series originally aired on February 28, 1992?
Answer:
19.0