Jupyter use on Cori, in terms of unique users per month, tripling over three years. Readers should compare the numbers in this figure to an average of 3000 unique users per month logging into Cori's 12 login nodes (via CLI or NX). Usage of Jupyter at NERSC in the summer spikes because of training events, tutorials, internships, etc. August and September 2019 are missing due to issues with data collection.