a series of reforms during the 1990s, the Senate consists of 128 senators:

* Two for each of the 32 states, elected under the principle of relative majority.
* One for each of the 32 states, assigned under the principle of first minority (i.e., awarded to the party or coalition with the second highest number of votes in the state).
* Thirty-two national senators-at-large, divided among the parties that received at least 3% of the vote in proportion to their share of the national vote.