Sylvan Grove, Kansas
Demographics
Table:
Historical population

Census	Pop.	Note	%±

1880	25	—
1900	319	—
1910	464	45.5%
1920	450	−3.0%
1930	530	17.8%
1940	540	1.9%
1950	506	−6.3%
1960	400	−20.9%
1970	403	0.8%
1980	376	−6.7%
1990	321	−14.6%
2000	324	0.9%
2010	279	−13.9%
2016 (est.)	258	[3]	−7.5%
U.S. Decennial Census

Examining the data table for 'Sylvan Grove, Kansas' (see 'Demographics'), create one factual sentence about the highlighted cells, without adding extra data and return it as JSON: {"answer": "YOUR ANSWER"}.