Table:
sociodemographic characteristics
2007
2010
2013
2016

percent

age

65 to 69
40.8
58.9
63.3
81.3

70 to 74
35.1
49.7
58.2
73.7

75 to 79
28.3
39.8
46.4
63.8

80 and older
19.3
29.4
35.7
49.2

gender

male
34.4
48.4
52.4
69.3

female
30.3
44.1
52.3
67.4

employment

currently employed
39.4
54.6
60.3
71.9

not employed
31.1
44.9
51.3
67.9

household size

unattached
27.7
39.6
47.0
62.7

living with others
33.8
48.4
54.6
70.6

highest level of education

less than a high school diploma
16.4
21.9
27.9
46.2

high school diploma
30.7
46.2
52.3
69.1

postsecondary below bachelor's degree
41.4
54.6
60.7
76.7

bachelor's degree or higher
56.3
69.7
76.4
89.0

location

rural
30.1
43.5
50.6
68.2

non-rural
32.7
46.7
52.8
68.3

health status

excellent / very good
37.9
50.2
57.3
72.6

good
30.5
45.8
51.2
66.9

fair / poor
22.4
37.2
41.7
61.9

Please determine the total count of rows and columns in the provided table, respectively. Return the result as JSON in the format {"row_number": "m", "column_number": "n"}, e.g., {"row_number": "12", "column_number": "7"}.

There are 28 rows and 5 columns in the table. So, the final answer is {"row_number": "28", "column_number": "5"}.