Table:
1991 cohort
2006 cohort

canadian-born men
canadian-educated immigrants
foreign-educated immigrants
canadian-born men
canadian-educated immigrants
foreign-educated immigrants

mean

first-year earnings
60,303
31,025
24,294
63,099
36,730
31,343

log first-year earnings
10.77
9.98
9.74
10.80
10.14
10.05

years since the base year
10.36
9.46
10.12
3.50
3.43
3.52

age in the base year
29.66
29.10
29.51
29.41
28.42
30.23

regional unemployment rate
7.29
7.06
6.82
5.96
5.98
5.99

years of prior canadian work experience
7.04
2.97
..
7.34
3.16
..

years of canadian study
..
3.96
..
..
3.84
..

origin-country tertiary education quality index
..
50.15
47.16
..
46.27
43.89

origin-country log gross domestic product per capita
..
8.00
7.77
..
7.63
7.44

graduate degrees
0.25
0.49
0.21
0.24
0.45
0.33

months of study in a year
0.08
0.29
0.12
0.58
1.62
0.60

french
0.33
0.06
0.05
0.25
0.04
0.04

other languages
..
0.03
0.23
..
0.01
0.08

visible minorities
0.04
0.91
0.76
0.10
0.85
0.79

atlantic region
0.07
0.03
0.01
0.06
0.03
0.01

quebec
0.28
0.19
0.16
0.23
0.25
0.23

manitoba and saskatchewan
0.06
0.04
0.02
0.06
0.04
0.04

alberta
0.11
0.10
0.08
0.11
0.15
0.13

british columbia
0.09
0.17
0.18
0.11
0.13
0.13

skilled worker class
..
0.62
0.29
..
0.77
0.69

other economic class
..
0.03
0.06
..
0.05
0.10

family class
..
0.25
0.43
..
0.14
0.19

refugees
..
0.10
0.21
..
0.04
0.02

origin-country official language english
..
0.29
0.51
..
0.30
0.41

origin-country official language french
..
0.08
0.03
..
0.15
0.07

no prior earnings in canada
0.01
0.09
..
0.00
0.12
..

low prior earnings
0.08
0.40
..
0.11
0.40
..

medium prior earnings
0.29
0.37
..
0.32
0.35
..

high prior earnings
0.62
0.14
..
0.57
0.14
..

number

sample size
4,523
3,176
4,191
7,714
7,730
9,615

person-years
79,574
37,872
56,836
43,788
37,660
48,265

Look at the table in the image and show any merged cells, specifying their locations with the JSON format of {'top-left':(A, B), 'bottom-right':(C, D)}, where A, B, C and D are indices (starting from 1) of the first row, the first column, the last row and the last column, respectively.

The merged cell areas are as follows:
{'top-left':(1, 1), 'bottom-right':(2, 1)}
{'top-left':(1, 2), 'bottom-right':(1, 4)}
{'top-left':(1, 5), 'bottom-right':(1, 7)}
{'top-left':(3, 2), 'bottom-right':(3, 7)}
{'top-left':(33, 2), 'bottom-right':(33, 7)}.