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 |
| --- | --- | --- | --- | --- | --- |
| Alabama 1 | John McDuffie | Democratic | 1918.0 | Re-elected | John McDuffie (D) 84.0% Aubrey Boyles (R) 16.0% |
| Alabama 2 | J. Lister Hill | Democratic | 1923.0 | Re-elected | J. Lister Hill (D) Unopposed |
| Alabama 4 | Lamar Jeffers | Democratic | 1921.0 | Re-elected | Lamar Jeffers (D) 68.1% Omar H. Reynolds (R) 31.9% |
| Alabama 6 | William B. Oliver | Democratic | 1914.0 | Re-elected | William B. Oliver (D) 99.0% C. M. Ayers (R) 1.0% |
| Alabama 8 | Edward B. Almon | Democratic | 1914.0 | Re-elected | Edward B. Almon (D) 90.1% Robert M. Sims (R) 9.9% |
Question:
When was incumbent William B. Oliver first elected?
Answer:
1914.0