Table:
sociodemographic characteristics
2016
2016
difference

percent

age

65 to 69
81.3
81.4
-0.1

70 to 74
73.7
74.0
-0.3

75 to 79
63.8
63.3
0.5

80 and older
49.2
49.2
0.0

gender

male
69.3
69.2
0.1

female
67.4
67.5
-0.1

employment

currently employed
71.9
69.4
2.5

not employed
67.9
68.1
-0.2

household size

unattached
62.7
66.7
-4.0

living with others
70.6
69.0
1.6

education

less than high school diploma
46.2
49.4
-3.2

high school diploma
69.1
69.8
-0.7

postsecondary below bachelor's degree
76.7
76.0
0.7

bachelor's degree or higher
89.0
86.8
2.2

household income

less than $20,000
..
54.1
..

$20,000 to under $40,000
..
63.7
..

$40,000 to under $60,000
..
68.4
..

$60,000 to under $80,000
..
73.0
..

$80,000 to under $100,000
..
69.7
..

$100,000 and over
..
79.4
..

location

rural
68.2
68.8
-0.6

non-rural
68.3
68.1
0.2

health status

excellent / very good
72.6
72.3
0.3

good
66.9
66.9
0.0

fair / poor
61.9
62.9
-1.0

In tables, merged cells are often found and we can denote them as JSON {'top-left':(A, B), 'bottom-right':(C, D)}, with '(A, B)' and '(C, D)' indicating the (row_id, column_id) of the top-left and bottom-right cells of the merged region. Please scan the table image provided, find all occurrences of merged cells, and return their coordinates in the stated format. It's important to remember that row and column IDs begin from 1.

The merged cell regions are as follows:
{'top-left':(1, 1), 'bottom-right':(2, 1)}
{'top-left':(2, 2), 'bottom-right':(2, 4)}
{'top-left':(3, 2), 'bottom-right':(3, 4)}
{'top-left':(8, 2), 'bottom-right':(8, 4)}
{'top-left':(11, 2), 'bottom-right':(11, 4)}
{'top-left':(14, 2), 'bottom-right':(14, 4)}
{'top-left':(17, 2), 'bottom-right':(17, 4)}
{'top-left':(22, 2), 'bottom-right':(22, 4)}
{'top-left':(29, 2), 'bottom-right':(29, 4)}
{'top-left':(32, 2), 'bottom-right':(32, 4)}.