East Caln Township, Chester County, Pennsylvania
Demographics
Table:
Historical population

Census	Pop.	Note	%±

1930	297	—
1940	315	6.1%
1950	403	27.9%
1960	758	88.1%
1970	1,739	129.4%
1980	2,187	25.8%
1990	2,619	19.8%
2000	2,857	9.1%
2010	4,838	69.3%
2016 (est.)	4,852	[2]	0.3%
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Observing the table that covers the 'Demographics' part of 'East Caln Township, Chester County, Pennsylvania', draft a brief sentence that explains what the highlighted cells show and return it as JSON: {"answer": "YOUR ANSWER"}.