The rate of inflation, based on the monthly wholesale price index (WPI), stood at 13.56 per cent for December 2021, compared to 1.9 per cent in the corresponding month of 2020, government data showed on Friday, January 14. Along with this, retail inflation also rose to 5.59 per cent in December, tracking a sharp rise in food prices. The next WPI inflation data will be released after Budget 2022 - scheduled to be presented on February 1.