Enrolments (sometimes called FTE's or Full Time Equivalent Enrolments) are counts of students enrolled in courses, and are usually reported by fiscal year for budgeting purposes. Fiscal year 2015 ends April 30, 2015.
In fiscal year 2015 (as estimated November 11, 2014) there are:
Overviews of FTE Course Enrolments, undergraduate and graduate plan counts, student/faculty ratios, fiscal years 2012/13 - 2014/15 (updated December 10, 2014):
Enrolment Overviews, 2003 - 2013 (updated January, 2013) [6p, [PDF]
See also Academic Unit Profiles from Queen's Institutional Planning.