Found something interesting in CIC manual (http://www.cic.gc.ca/english/resources/manuals/op/op12-eng.pdf)
7.7. Reviewing applicants for financial sufficiency
Officers need to satisfy themselves that applicants have sufficient financial resources to pay their
tuition fees, transportation costs to and from Canada, as well as living expenses for themselves
and any family members who may be accompanying them, without the need to engage in
employment.
Students are required to demonstrate financial sufficiency for only the first year of studies,
regardless of the duration of the course or program of studies in which they are enrolled. In other
words, a single student entering a four-year degree program with an annual tuition fee of $15,000
must demonstrate funds of $15,000 to satisfy the requirements, and not the full $60,000 which
would be required for four years. Officers should be satisfied though that the probability of
funding for future years does exist, i.e., parents are employed; scholarship is for more than one
year. Applications for extensions made to CPC-V must also meet this requirement.