We have 2 sheets now maintained by RM which regularly update the Open Interest position at the end of every trading sesssion.
This first one is : Current Month OI.
This will track the delta and the OI co- relations
This next one by RM tracks the option OI of the FII's in particular. There is a lot of material on the web on this subject, but in my opinion the link below is the finest.
Link : OI Analysis