If you go to http://www.cic.gc.ca/english/immigrate/cec/apply-who.asp it says you need to have at least 2 years full time experience or equivalent. They consider full time to be 1950 hours a year so if you made so many hours in your year and 4 months of working that you already have 2x1950, there is a slim chance they might accept you. Otherwise, you need a new work permit and complete the 2 years. If you have questions, call CIC and ask.