South Bačka District
Demographics
Table:
Historical population
Year	Pop.	±% p.a.
1948	358,722	—
1953	377,282	+1.01%
1961	432,873	+1.73%
1971	486,083	+1.17%
1981	538,016	+1.02%
1991	553,027	+0.28%
2002	593,666	+0.65%
2011	615,371	+0.40%
Source: [3]

Consulting the data table for 'South Bačka District' in the 'Demographics' section, write a one-sentence description of the highlighted cells and provide it inside the JSON object {"answer": "YOUR ANSWER"}.