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 | Richard S. Whaley | Democratic | 1913.0 | Retired Democratic hold | W. Turner Logan (D) 92.6% ? Saspartas (I) 7.4% |
| South Carolina 2 | James F. Byrnes | Democratic | 1910.0 | Re-elected | James F. Byrnes (D) Unopposed |
| South Carolina 3 | Frederick H. Dominick | Democratic | 1916.0 | Re-elected | Frederick H. Dominick (D) Unopposed |
| South Carolina 4 | Samuel J. Nicholls | Democratic | 1915.0 | Retired Democratic hold | John J. McSwain (D) Unopposed |
| South Carolina 5 | William F. Stevenson | Democratic | 1917.0 | Re-elected | William F. Stevenson (D) Unopposed |
| South Carolina 6 | Philip H. Stoll | Democratic | 1919.0 | Re-elected | Philip H. Stoll (D) Unopposed |
Question:
What year was incumbent william f. stevenson first elected?
Answer:
1917.0