A new flag was also adopted at the same time.
The current flag was adopted in 1968, but the design has been used since 1821.
The flag was adopted in 1999 as the result of a competition.
However, the flag adopted by the government was slightly different.
The city's flag and coat of arms were adopted later, in 1951.
A third flag was adopted in late 1821, with a different coat of arms.
Two years later, in 1932, a new flag for the republic was adopted.
But when it came to a final decision, the current flag was adopted by the Legislature.
The original flag was adopted at independence on June 29, 1976.
The flag was only officially adopted on April 21, 1999.