marcos was overthrown as a result of the 1986 people power revolution. the new president, corazon aquino, appointed a constitutional commission to write a new constitution. the electorate approved the constitution in 1987, restoring the bicameral congress. instead of electing 8 senators every two years, the new constitution provided that 12 senators would be elected every three years. as part of the transitory provisions, the voters elected 24 senators in the 1987 election, to serve until 1992. in the 1992 election, the voters still voted for 24 candidates, but the first 12 candidates with the most votes were to serve until 1998, while the next 12 were to serve only until 1995. thereafter, 12 candidates are elected every second monday of may every third year since 1995.