The current Senate has a 20-18 split in favor of the opposition coalition.
The final result gave the broad opposition coalition 72 seats, a majority.
The Green Party is 1 of 16 groups in the opposition coalition.
The opposition coalition says it won 41 seats in the 70-seat city council.
Their failure also appeared to reduce the chance of creating an effective opposition coalition.
The formation of an opposition coalition slowly began to take shape during the congress.
The opposition coalition's strength increased from 37 to 53 seats.
You said that an opposition coalition has been formally created this morning?
In total they won 62.7% as against 37.3% for the opposition coalition.
In 2009, it fought the general elections as part of the opposition coalition.