Shares at the Pakistan Stock Exchange (PSX) began the new year in the green, posting the second-highest single-day gain in the history of the benchmark index on Monday. According to the PSX website, the KSE-100 index struck 63,935.56 points at 10am, up 1484.52 points or 2.38 per cent from the previous close of 62,451.04 points. The index finally closed at 64,661.78, gaining a cumulative 2210.74