Hello!

If we talk specifically about Delhi University, it doesn't depend on last year's cutoffs at all. To a little extent, Cutoffs depend on the toppers and overall result of Class 12th. But Yes, previous year's cutoffs can give you an idea that approximately whate percentage you need to get the course and college of your choice. 

Since you needed a glimpse of last year's cutoffs, here it is!

https://cutoffs.aglasem.com/tag/du-cut-off-2019

All the best!