| Date | Purchase ( Rs Crore ) | Sale ( Rs Crore ) | Investment ( Rs Crore) | Investment ($US mm) | | Jan-2012 | 43,924.60 | 33,017.50 | 10,907.40 | 2,132.44 | | Dec-2011 | 44,075.60 | 43,967.60 | 107.90 | 33.37 | | Nov-2011 | 39,612.40 | 43,810.30 | -4,197.90 | -787.08 | | Oct-2011 | 46,867.50 | 45,227.10 | 1,640.70 | 339.32 | | Sep-2011 | 47,722.00 | 47,880.50 | -158.30 | 6.97 | | Aug-2011 | 40,527.50 | 50,015.50 | -9,488.10 | -2,090.72 | |