I can't respond exactly to the question about the expenses for that department. What you're dealing with under “Information” is cost related to IT telecommunications. Those budgets from ministers' offices are set each year on an individual basis. So the expenses for each minister's office are set through a process that is centralized. The actual reasons for variances—
Evidence of meeting #49 for Public Accounts in the 40th Parliament, 3rd session. (The original version is on Parliament’s site, as are the minutes.) The winning word was question.
A recording is available from Parliament.