| Date | Purchase ( Rs Crore ) | Sale ( Rs Crore ) | Investment ( Rs Crore) | Investment ($US mm) | | May-2012 | 23,925.80 | 23,070.00 | 856.00 | 160.79 | | Apr-2012 | 41,091.90 | 42,200.50 | -1,109.10 | -205.53 | | Mar-2012 | 63,795.10 | 55,413.80 | 8,381.10 | 1,684.82 | | Feb-2012 | 79,898.60 | 54,686.60 | 25,212.10 | 5,127.67 | | 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 | 16,269.40 | 21,984.50 | -5,715.00 | -1,098.25 | |