Prices of seven out of 10 stocks listed on Korea's main and secondary stock markets fell last month as the country's bourses posted their steepest monthly declines since the 2008 global financial crisis, market data showed Sunday. A total of 1,859 stocks had closed lower as of Friday than at the end of June, according to data from the Korea Exchange (KRX). They accounted for some 70 percent of a total of 2,645 companies listed on the benchmark Korea Composite Stock Price Index (KOSPI) and the tech-heavy Korea Securities Dealers Automated Quotations (KOSDAQ). By market, 566 stocks, or 62 percent of the KOSPI's 917 listed companies, declined, while 1,293 stocks, or 75 percent of the KOSDAQ's 1,728 listings, also fell. The KOSPI tumbled 22.2 percent in July from a month earlier, while the KOSDAQ dropped 21.4 percent. The monthly declines were the steepest since October 2008, when global markets were battered by the global financial crisis. Among KOSDAQ-listed companies, biotechnology firm Kolon TissueGene was the biggest loser, plunging 86 percent during the month to 13,000 won ($8.99) from 9