The US had a trade surplus with NAFTA countries of $28.3 billion for services in 2009 and a trade deficit of $94.6 billion (36.4% annual increase) for goods in 2010. This trade deficit accounted for 26.8% of all US goods trade deficit. A 2018 study of global trade published by the Center for International Relations identified irregularities in the patterns of trade of NAFTA ecosystem using network theory analytical techniques. The study showed that the US trade balance was influenced by tax avoidance opportunities provided in Ireland.