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It currently comprises 32 senators who are elected for four-year terms. Congressional elections are held in even numbered years not divisible by four, when the entire Chamber and Senate are replaced.
The following table shows the composition of the Senate at the start of the most recent legislative periods.
| Party | 1998 | 2002 |
|---|---|---|
| Dominican Revolutionary Party (PRD) | ||
| Dominican Liberation Party (PLD) | ||
| Social Christian Reformist Party (PRSC) | ||
| Total |