Table:
Historical population

Census	Pop.	Note	%±

1940	433	—
1950	898	107.4%
1960	1,485	65.4%
1970	1,504	1.3%
1980	1,306	−13.2%
1990	1,906	45.9%
2000	1,695	−11.1%
2010	1,642	−3.1%
2016 (est.)	1,618	[2]	−1.5%
U.S. Decennial Census[5]

This is a table picture. Can you figure out the row and column numbers for this particular table? Return the result as JSON in the format {"row_number": "m", "column_number": "n"}, e.g., {"row_number": "12", "column_number": "7"}.

This table has 12 rows and 4 columns. Thus, the final answer is {"row_number": "12", "column_number": "4"}.