South Korean stocks ended 1.81 percent lower on Monday as foreigners dumped shares amid growing concerns over political protests in Cairo, analysts said. The local currency lost ground against the U.S. dollar.   The benchmark Korea Composite Stock Price Index (KOSPI) plunged 38.14 points to 2,069.73. Trading volume was moderate at 316.9 million shares worth 7.29 trillion won ($6.5 billion), with