Annual international merchandise-trade flows from UN Comtrade (HS classification). Pass reporter (the country whose trade you want; ISO-2/ISO-3 like 'US'/'USA', a UN M49 number, or 'World'), optional partner (counterparty; default World), year (YYYY), flow (export|import), and commodity: 'TOTAL' (all goods, default), a specific HS code ('27', '8703'), or 'AG2'/'AG4'/'AG6' for a top-commodity breakdown at the 2/4/6-digit level. Returns trade value (USD), net weight, quantity, and the HS commodity, sorted by value. Country names are resolved from Comtrade's own reference data.