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:
| District | Incumbent | Party | First elected | Result | Candidates |
| --- | --- | --- | --- | --- | --- |
| South Carolina 1 | Thomas S. McMillan | Democratic | 1924.0 | Re-elected | Thomas S. McMillan (D) Unopposed |
| South Carolina 2 | Butler B. Hare | Democratic | 1924.0 | Re-elected | Butler B. Hare (D) Unopposed |
| South Carolina 3 | Frederick H. Dominick | Democratic | 1916.0 | Re-elected | Frederick H. Dominick (D) Unopposed |
| South Carolina 4 | John J. McSwain | Democratic | 1920.0 | Re-elected | John J. McSwain (D) Unopposed |
| South Carolina 5 | William Francis Stevenson | Democratic | 1917.0 | Re-elected | William Francis Stevenson (D) Unopposed |
| South Carolina 6 | Allard H. Gasque | Democratic | 1922.0 | Re-elected | Allard H. Gasque (D) Unopposed |
Question:
what year was william francis stevenson first elected?
Answer:
1917.0