Table:
volunteer rate

2013
2010
2007
2004

percentage

total
44
47
46
45

men
42
46
45
44

women
45
48
47
47

age

15 to 19
66
66
65
65

20 to 24
42
48
47
43

25 to 34
42
46
40
42

35 to 44
48
54
52
51

45 to 54
45
45
48
47

55 to 64
41
41
40
42

65 to 74
38
40
40
39

75 and over
27
31
29
23

This image shows a table. Determine whether this table contains merged cells and output merged cell regions with the JSON format of {'top-left':(R1, C1), 'bottom-right':(R2, C2)}, where R1, C1, R2 and C2 represent the indices of the first row, the first column, the last row, and the last column in the merged region. Row and column indices are numberd from 1.

The merged cell regions are as follows:
{'top-left':(1, 1), 'bottom-right':(3, 1)}
{'top-left':(1, 2), 'bottom-right':(1, 5)}
{'top-left':(3, 2), 'bottom-right':(3, 5)}
{'top-left':(7, 1), 'bottom-right':(7, 5)}.