Hi all,
          Many wikisources have implemented the facility to download the wikisource content in a variety of formats through wsexport tool. And the download statistics language wise is give at https://tools.wmflabs.org/wsexport/tool/stat.php

T. Shrinivasan and rajeshkumar have written code and come with reporting of Bookwise download details through ws-export tool updated on a daily basis from the wsexport data. 

Currently the data is done for three languages. Tamil (ta), Bengali (Bn) Telugu (te). 

The links are 

If any language is interested in this report and have suggestions to improve or collaborate can kindly contact T. Shrinivasan. I copying this mail to his mail id too. 

J. Balaji