"Of the five permanent members of the UN Security Council, Russia and China do not provide any detailed information on their small arms exports, which are thought to be extensive. France now provides an annual export report, that covers quantities and types of weapons exported and licensed for export, but not their monetary value. Britain provides extensive information, including the number of weapons it has licensed for export. Only the United States produces a highly detailed
annual report, breaking down its exports by destination and weapon type and also providing information on quantity and value of exports."
UN report
Further quotes from document:

"Challenging corruption
The international arms trade is rife with corruption, a point made increasingly by the global anti-corruption group Transparency International (TI). The illicit trade depends upon the complicity of
state employees, such as customs officials and policemen, whose silence is bought with bribes. In the legal trade, arms contracts are frequently facilitated with “commission payments” and kickbacks to
military personnel and government employees."
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"For example, speaking on behalf of the European Union at the opening plenary of the conference, a Belgian official noted that “transparency regarding legal movements of small arms and light weapons can be of considerable help in detecting and combating illicit flows. Countries should therefore be encouraged to make available information on their exports and imports, be it in a regional context or on a global level.” "