https://pastebin.com/H9e2SG9t
Based on the old exp.txt tables. This only works for base level 999.
If you want to use a lower level, you need to comment out all entries above that level. E.g. if you want base level 500, you need to comment out entries 500-999.
The formula for no. of entries you need is [Max Base Level - 1]. So if max level is 400, you need 399 entries; 250 needs 249, and so on.
Let me know if there are any issues with it.