On the NSE website, there is no data prior to 2015.
I manually collected all the data and manipulated it into yearly .csv files. Due to need for manual collection, it will be only updated monthly. Compiling into yearly data will only be done yearly, as that is mostly cosmetic. Those who need it for regular analysis can use the monthly files hereafter.
Automated analyses on the data will be published on this page: Insider trading report
Link for data download: