SANTIAGO, Chile, Feb. 28, 2019 /PRNewswire/ -- Sociedad Química y Minera de Chile S.A. (SQM) (NYSE: SQM; Santiago Stock Exchange: SQM-B, SQM-A) reported earnings today for the twelve months ended December 31, 2018 of US$439.8 million (US$1.67 per ADR), an increase from US$427.7 million...