Planned since the 1960s , construction of the Metro was not officially launched until the late 1990s mainly .
The city did not experience an urgent need for an underground system in addition to the stalled construction due to lack of sufficient funding .
Planned since the 1960s , construction of the Metro was not officially launched until the late 1990s mainly because the city did not experience an urgent need for an underground system in addition to the stalled construction due to lack of sufficient funding .