North Buena Vista, Iowa
Demographics
Table:
Historical populations
Year	Pop.	±%
1910	162	—
1920	144	−11.1%
1930	183	+27.1%
1940	203	+10.9%
1950	148	−27.1%
1960	150	+1.4%
1970	118	−21.3%
1980	155	+31.4%
1990	145	−6.5%
2000	124	−14.5%
2010	121	−2.4%
2016	116	−4.1%
Source:"American FactFinder". United States Census Bureau. and Iowa Data Center
Source: U.S. Decennial Census[6]

Given the following table concerning 'North Buena Vista, Iowa', section 'Demographics', draft a brief sentence that explains what the highlighted cells show and return it as JSON: {"answer": "YOUR ANSWER"}.