RIYADH: Saudi Arabia’s Tadawul All Share Index dropped on Monday, losing 32.84 points, or 0.26 percent, to close at 12,377.03.   The total trading turnover of the benchmark index was SR6.55 billion ($1.75 billion), as 65 of the listed stocks advanced, while 170 retreated.    The MSCI Tadawul Index also dropped by 3.79 points, or 0.25 percent, to close at 1,541.82.   The Kingdom’s parallel market Nomu lost 48.69 points, or 0.16 percent, to close at 31,056.38. This comes as 37 of the listed stocks advanced and 43 retreated.