For U.S.-flag shipping on the Great Lakes, 2019 was a good year. Total cargos were 90 million net tons, up 7.5 percent over 2018 and 4.6 percent over the 5-year average. 49.7 million net tons of iron ore were shipped, up 8.5 percent over 2018 and 11.7 percent over the five year.
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https://www.marinelink.com/news/great-lakes-shipping-companies-navigate-479342