If you've now completed your 2017 and 2018 NYS non-resident returns, you know the amount of tax you owed NY for each of those years. Here is the information on the interest and penalties that you might be assessed by NY:
https://www.tax.ny.gov/pit/file/interest_and_penalties.htm
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
