Table:
variables
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
pooled over all years
average annual percent change

number
percent

frontier firms relative to non-frontier firms
2.80
2.77
2.73
2.70
2.70
2.67
2.64
2.59
2.48
2.39
2.36
2.33
2.28
2.36
2.54
-0.70

importers relative to non-importers
1.22
1.21
1.23
1.27
1.28
1.28
1.28
1.28
1.27
1.28
1.28
1.28
1.28
1.28
1.27
0.31

exporters relative to non-exporters
1.09
1.10
1.16
1.13
1.13
1.12
1.09
1.09
1.11
1.12
1.11
1.11
1.11
1.12
1.10
0.08

foreign-controlled firms relative to domestic firms
1.23
1.21
1.21
1.22
1.22
1.25
1.23
1.23
1.22
1.26
1.29
1.32
1.36
1.34
1.25
0.16

high capital intensity firms relative to low capital intensity firms
1.23
1.23
1.21
1.20
1.19
1.19
1.19
1.19
1.17
1.17
1.16
1.17
1.16
1.16
1.19
-0.28

high research and development intensity firms relative to low research and development intensity firms
1.28
1.29
1.27
1.25
1.27
1.29
1.29
1.31
1.31
1.32
1.33
1.34
1.35
1.33
1.30
0.13

old firms relative to young firms
1.18
1.17
1.17
1.16
1.13
1.12
1.10
1.11
1.11
1.10
1.10
1.10
1.10
1.10
1.12
-0.38

medium-sized firms relative to small firms
1.06
1.07
1.12
1.09
1.10
1.09
1.09
1.09
1.10
1.11
1.12
1.14
1.16
1.17
1.11
0.39

large firms relative to small firms
0.99
1.01
0.98
0.96
0.98
0.99
0.99
0.99
0.97
0.96
0.99
1.02
1.04
1.06
1.00
0.05

A table may have multiple merged cells and we can represent a merged cell region by a JSON {'top-left':(X1, Y1), 'bottom-right':(X2, Y2)}. Here, '(X1, Y1)' and '(X2, Y2)' denote the coordinates (row_id, column_id) of the top-left and bottom-right cells of the merged regions, respectively. Now, based on the shown table image, please find all merged cells in this table and return their representations in the above format. Keep in mind that row and column IDs start from 1.

The merged cell regions are as follows:
{'top-left':(1, 1), 'bottom-right':(2, 1)}
{'top-left':(2, 2), 'bottom-right':(2, 16)}.