Two days ago I sent a mail to a university I am interested in, asking for the ratio of Early-Decision–accepted students to Regular-Decision–accepted ones. I received this answer part of larger mail.
Offhand I do not know the ratio of Early Decision applicants to Regular Decision applicants.
What does offhand mean? I used a few English–French dictionaries but it still remains unclear. Moreover, what is the tone of this sentence? I feel a lot of annoyance — am I right?