Table:
methodology 1: one year employment
methodology 2: two-year average employment
methodology 3: three-year average employment
methodology 4: three-year average employment and firm belongs to the size class at least two years out of three
methodology 5: final sample - methodology 4, and medium-sized firms that were previously large are excluded

number

medium-sized firms
65,659
64,885
63,894
61,630
59,397

outcome in post-transition period

remain medium-sized
57,259
53,869
50,876
50,341
48,787

become large
923
1,256
1,499
1,230
1,061

become small
7,251
8,456
9,220
7,638
7,544

go out of business
226
1,304
2,299
2,111
2,005

percent

remain medium-sized
87.2
83.0
79.6
82.1
82.1

become large
1.4
1.9
2.3
2.0
1.8

become small
11.0
13.0
14.4
12.5
12.7

go out of business
0.3
2.0
3.6
3.4
3.4

medium-sized status is observed at least twice in the three years preceding the transition year
88.8
93.4
96.0
100.0
100.0

outcome size class is observed at least twice in the three years following the transition year

become large
80.4
87.9
91.0
100.0
100.0

become small
77.8
90.4
93.3
100.0
100.0

Different merged cells often exist in a table and they can be represented by the JSON {'top-left':(x, y), 'bottom-right':(m, n)}. In this JSON item, '(x, y)' and '(m, n)' are the (row_id, column_id) coordinates for the top-left and bottom-right cells in the merged region, respectively. Please examine the provided table image, identify all merged cells, and return their details using the above-mentioned format. Remember, the numbering for both rows and columns starts at 1.

The merged cell areas are as follows:
{'top-left':(1, 1), 'bottom-right':(2, 1)}
{'top-left':(2, 2), 'bottom-right':(2, 6)}
{'top-left':(4, 2), 'bottom-right':(4, 6)}
{'top-left':(9, 2), 'bottom-right':(9, 6)}
{'top-left':(15, 2), 'bottom-right':(15, 6)}.