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This resulted in an exponential rise in CFC production. The annual global output of the two dominant compounds, F-11 and F-12, later known as CFC-11 and CFC-12 or R-11 and R-12, rose from less than 550 tons in 1934 to more than 50,000 tons in 1950, to about 125,000 tons in 1960, and then it soared to the peak of 812,522 tons in 1974, with the US accounting for nearly half of the total
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