Table:
time period
revised average growth in annual gdp
previously published average growth in annual gdp
mean absolute revision to the growth in annual gdp
revised average growth in annual real gdp
previously published average growth in annual real gdp
mean absolute revision to the growth in annual real gdp

1982 to 1989
7.80
7.79
0.13
2.88
2.90
0.14

1990 to 1999
4.16
4.16
0.08
2.37
2.38
0.08

2000 to 2009
4.62
4.63
0.14
2.08
2.09
0.10

2010 to 2014
4.72
4.74
0.20
2.53
2.54
0.18

1982 to 2014
5.27
5.27
0.13
2.43
2.44
0.11

Different merged cells often exist in a table and they can be represented by the JSON {'top-left':(X, Y), 'bottom-right':(Z, W)}. In this JSON item, '(X, Y)' and '(Z, W)' 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.

This table does not contain any merged cells.