US was responsible for 82% of all $188 billion in global weapons exports (by value, in 2014 dollars).
Top weapons exporters by value:
US: $153.8B
EU states: $15B
Russia: $10B
China: $3B

State Dept WMEAT, Table III

From 2004 to 2014, the global annual value of international arms transfer deliveries
appears to have averaged about $151 billion, in constant 2014 U.S. dollar terms, and to have risen by about 74%, from about $108 billion to about $183 billion, despite declining after 2012. The arms trade’s share of world trade in goods and services appears to have ranged from about 0.6% to about 0.9%, troughing at about 0.6% in 2007-2008.

During the period, about 79% of the world arms trade, by value, appears to have been
supplied by the United States, about 10% by the European Union, about 5% by Russia, and less than 2% by China. The U.S. share of the world arms market appears to have grown, while the E.U. share appears to have diminished, with no clear trend in the Russian and Chinese shares.

Countries in the richest quintile of world population appear to have accounted for about 97% of world arms exports and about 66-67% of world arms imports, regardless of whether quintiles are based on national GDP per capita at a real market exchange rate or at purchasing power parity. By either standard, the richest quintile was the only GDP-per-capita quintile with a positive arms trade balance.

Countries in the most democratic quintile of world population appear to have accounted for 92% of world arms exports and about 55% of world arms imports. The most democratic quintile was the only degree-of-democracy quintile with a positive arms trade balance.

In constant 2014 U.S. dollar terms, U.S. arms exports appear to have averaged about
$120 billion a year, while U.S. arms imports – of arms merchandise only, inasmuch as no data on U.S. arms services imports are readily available – appear to have averaged about $5 billion a year. Over the period, the arms trade surplus of the United States appears to have offset about 17% of its total trade deficit.

About 70% of U.S. arms exports appear to have been delivered to countries in the richest quintile of world population, which appear to have sourced 84-85% of their arms imports from the United States. About 59% of U.S. arms exports appear to have been delivered to countries in the most democratic quintile of world population, which appear to have sourced about 86% of their arms imports from the United States. A growing proportion of U.S. arms exports, averaging about 14% for the period, went to multinational entities or entities not specified by the governmental exporting or export licensing authority.

Both the growth in the world arms trade and the increase in the U.S. share of world arms exports during the period, from about 74% in 2004 to about 82% in 2014, appear to be due largely to increasing reliance on the United States as a source of arms by other rich, democratically-governed countries

World Military Expenditures and Arms Transfers 2016
https://www.state.gov/t/avc/rls/rpt/wmeat/2016/index.htm