This is a classic mistake. i in your case is already an element from array (i.e. another list), not an index of array (not an int), so
if Volume == i[2]:
counter += 1
You can check the Python tutorial. Also, try doing this:
for i in array:
print (i)
And see what you get!
Also I would advise to stick to naming conventions: variables are normally lower-case (volume, not Volume). In this case i is misleading. row or elem would be much more suitable.
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