On a month-by-month basis it is sometimes the case that there is no trade in a particular sector or that that trade in this sector is not reported. In this case, the value shown will be “0”.
Whilst a certain number of “0” values can be expected and is normal. the averaging dataset accounts for this by averaging the flows between two countries and therefore there is a lower chance of there being zeroes in it. You can switch between the datasets from the searchbar on the interface.