All grin block chain data is available via node API if you choose to run node in archive mode but it takes a long time sync and most users opt to choose run it fast-sync, pruned mode.
So somehow if you need block chain data for research or any kind of task and don't want to wait for syncing a full archive node, you can download it from this repo in chunks.
Data is in json format and zipped with 7z. You can find all chunks in releases section or with links down below.
We also have an example python notebook on transaction count calculation and prediction which basically shows how to import data into python and process.