Read the given data and answer the question that follow. There are four products - AB, CD, EF and GH. The following table shows the quantity sold in four cities in 1983 and 1984
Products
Bangalore
Calcutta
Delhi
Chennai
1983
1984
1983
1984
1983
1984
1983
1984
AB
30
25
45
40
60
25
30
40
CD
30
35
40
25
25
20
30
25
EF
55
25
35
20
45
45
20
20
GH
50
30
45
40
20
20
60
55
Question: 1
For which of the product did the quantity sold not decrease between 1983-84 for all the cities together?