India, June 8 -- The Indonesia stock market has finished lower in four straight sessions, plummeting more than 850 points or 15 percent in that span. The Jakarta Composite Index now sits just above the 5,340-point plateau although it may continue to spiral on Tuesday. The JCI finished sharply lower again on Monday with losses across the board, continuing to plummet due to currency depreciation, fiscal policy concerns and regulatory threats. For the day, the index cratered 252.63 points or 4.52 percent to finish at 5,342.14 after trading between 5,317.91 and 5,523.94. Among the actives, Bank CIMB Niaga tanked 5.16 percent, while Bank Mandiri retreated 3.39 percent, Bank Danamon Indonesia plunged 10.48 percent, Bank Negara Indonesia tumbled 6...