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:
| Date of release | Title | Billboard peak | RIAA cert. | Label |
| --- | --- | --- | --- | --- |
| August 13, 1973 | (Pronounced 'Lĕh-'nérd 'Skin-'nérd) | 27 | 2× Platinum | MCA |
| April 15, 1974 | Second Helping | 12 | 2× Platinum | MCA |
| March 24, 1975 | Nuthin' Fancy | 9 | Platinum | MCA |
| February 2, 1976 | Gimme Back My Bullets | 20 | Gold | MCA |
| October 17, 1977 | Street Survivors | 5 | 2× Platinum | MCA |
| June 11, 1991 | Lynyrd Skynyrd 1991 | 64 | — | Atlantic |
| February 16, 1993 | The Last Rebel | 64 | — | Atlantic |
| August 9, 1994 | Endangered Species | — | — | Capricorn |
| April 29, 1997 | Twenty | 97 | — | CMC |
| August 10, 1999 | Edge of Forever | 96 | — | CMC |
| September 12, 2000 | Christmas Time Again | 38 | — | Sanctuary |
| May 20, 2003 | Vicious Cycle | 30 | — | Sanctuary |
| September 29, 2009 | God & Guns | 18 | — | Roadrunner |
| August 21, 2012 | Last of a Dyin' Breed | 14 | — | Roadrunner |
Question:
When was twenty released?
Answer:
April 29, 1997