May 21, 2009 (China Knowledge) - Hong Kong stocks retreated on Thursday, and the Hang Seng Index, the benchmark, opened 184 points lower at 17,291. After touching the intraday low of 17,172.64 points, the blue-chip Hang Seng Index fell 276.35 points or 1.58% to close at 17,199.49.Mainboard turnover rose to HK$60.939 billion. The Hang Seng China Enterprise Index, which tracks the overall perf
.....