The trade balance is the difference between exports and imports. The balance of a net exporter appears as a negative value (-). The balance of geographic and geopolitical zones is simply the sum of the trade balance of all the countries.
Petroleum products are all liquid hydrocarbons, obtained by the refining of crude oil and NGL and by treatment of natural gas, in particular, LPG production (Liquid Petroleum Gas) includes LPG from natural gas separation plants. The alcohol used as motor fuel in Brazil as well as fuels derived from coal in South Africa are not included in oil products.