Canada was the world's nineteenth-largest steel exporter in 2018. In year-to-date 2019 (through March), further referred to as YTD 2019, Canada exported 1.39 million metric tons of steel, a 22 percent decrease from 1.79 million metric tons in YTD 2018. Canada's exports represented about 1.5 percent of all steel exported globally in 2017, based on available data. By volume, Canada's 2018 steel exports represented just over one-tenth the volume of the world's largest exporter, China. In value terms, steel represented 1.4 percent of the total goods Canada exported in 2018. The growth in exports in the decade since 2009 has been 29%. The largest producers in 2018 were ArcelorMittal, Essar Steel Algoma, and the first of those alone accounted for roughly half of Canadian steel production through its two subsidiaries. The top two markets for Canada's exports were its NAFTA partners, and by themselves accounted for 92 percent of exports by volume. Canada sent 83 percent of its steel exports to the United States in YTD 2019. The gap between domestic demand and domestic production increased to -2.4 million metric tons, up from -0.2 million metric tons in YTD 2018. In YTD 2019, exports as a share of production decreased to 41.6 percent from 53 percent in YTD 2018.