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 | Elected | Status | Opponent |
| --- | --- | --- | --- | --- | --- |
| Illinois1 | Charles Hayes | Democratic | 1983.0 | Re-elected | Charles Hayes (D) 93.8% Babette Peyton (R) 6.2% |
| Illinois2 | Gus Savage | Democratic | 1980.0 | Re-elected | Gus Savage (D) 78.2% William T. Hespel (R) 21.8% |
| Illinois3 | Marty Russo | Democratic | 1974.0 | Re-elected | Marty Russo (D) 70.9% Carl L. Klein (R) 29.1% |
| Illinois6 | Henry Hyde | Republican | 1974.0 | Re-elected | Henry Hyde (R) 66.7% Robert J. Cassidy (D) 33.3% |
| Illinois7 | Cardiss Collins | Democratic | 1973.0 | Re-elected | Cardiss Collins (D) 79.9% Michael Dooley (R) 20.1% |
| Illinois9 | Sidney R. Yates | Democratic | 1964.0 | Re-elected | Sidney R. Yates (D) 71.2% Herb Sohn (R) 28.8% |
| Illinois15 | Edward Rell Madigan | Republican | 1972.0 | Re-elected | Edward Rell Madigan (R) unopposed |
| Illinois17 | Lane Evans | Democratic | 1982.0 | Re-elected | Lane Evans (D) 66.5% Dan Lee (R) 33.5% |
| Illinois20 | Dick Durbin | Democratic | 1982.0 | Re-elected | Dick Durbin (D) 66.2% Paul Jurgens (R) 33.8% |
Question:
What district had elections in 1964?
Answer:
Illinois9