Prior to the mid-1990s the world market for magnesium metal production was dominated by electrolytic processes, with the United States as the dominant supplier. For over 80 years Dow Chemical operated a 65 kton/y capacity plant near Freeport, TX, based on seawater extracted magnesium chloride electrolysis, which was the prime magnesium metal supplier until its closure in 1998. As of 2005, there is a single US producer, in Utah, US Magnesium, a company borne from now-defunct Magcorp. Very severe antidumping tariffs are in the process of being imposed on Chinese imports. As of 2005, the US produced about 45 out of a 615 kton/yr (7%), compared to 140 out of 311 kton/yr (45%) in 1995. In contrast, in 2005 China produced 400 out of the 615 kton/yr (65%), compared to 12 out of 311 kton/yr (4%) in 1995.