Swissvale, Pennsylvania
Demographics
Table:
Historical population

Census	Pop.	Note	%±

1900	1,716	—
1910	7,381	330.1%
1920	10,908	47.8%
1930	16,029	46.9%
1940	15,919	−0.7%
1950	16,488	3.6%
1960	15,089	−8.5%
1970	13,819	−8.4%
1980	11,345	−17.9%
1990	10,637	−6.2%
2000	9,653	−9.3%
2010	8,983	−6.9%
2016 (est.)	8,769	[2]	−2.4%
Sources:[6][7][8][9][10]

Referring to the following table concerning 'Swissvale, Pennsylvania' (see 'Demographics'), draft a brief sentence that explains what the highlighted cells show and return it as JSON: {"answer": "YOUR ANSWER"}.