Table:
Historical population

Census	Pop.	Note	%±

1930	1,468	—
1940	1,622	10.5%
1950	2,519	55.3%
1960	4,495	78.4%
1970	5,591	24.4%
1980	6,816	21.9%
1990	7,613	11.7%
2000	7,862	3.3%
2010	7,461	−5.1%
2016 (est.)	7,585	[10]	1.7%
U.S. Decennial Census[28]

Tell me how many rows and columns exist in the given table. Output the final answer in the JSON format {"row_number": "m", "column_number": "n"}. For instance, if the table has 5 rows and 4 columns, the answer would be {"row_number": "5", "column_number": "4"}

This table has 13 rows and 4 columns. Thus, the final answer is {"row_number": "13", "column_number": "4"}.