Which report are you referring to?
I had hoped you'd come to see that they paint a timeline
For example: the last report from 2020 states that they had a grand total of 0 (zero) kgs of uranium enriched beyond civil use at that time. This greatly contrasts with your statement that they "stayed at 60% for four years".
These subtle hints suggest you're basically unfamiliar with these reports and make me wonder how much you really care about this conflict