1963 Republic of the Congo constitutional referendum
Results
Table:
Choice

Votes

%

For
419,893
86.1

Against
67,825
13.9

Invalid/blank votes
6,561
–

Total
494,279
100

Registered voters/turnout
539,219
91.7

Source: African Elections Database

Studying the table information on '1963 Republic of the Congo constitutional referendum', section 'Results', create one factual sentence about the highlighted cells, without adding extra data and provide it inside the JSON object {"answer": "YOUR ANSWER"}.