Profits of China's 37 big state-owned textile manufacturers plunged by 37.4 percent year-on-year from January to April following the expiration of a global quota system on January 1 that brought stiffer competition, China State-owned Assets Supervision and Administration Commission said on its Website yesterday. They posted a combined profit of 370 million yuan (US$45 million) in the four months. The profits were down despite a 11.8 percent rise in exports which were worth 3.4 billion yuan. The drop in profits is also due to the trade tensions between China and the Western countries and domestic measures to voluntarily control exports, industry officials said.