Admission averages fluctuate every year and semester. It's determined by the amount of people applying and the average they're bringing in....so only use what you find online as a guideline, especially for UBC.
Generally, I'd say high 80s to low 90s is safe for UBC. Keep in mind that they have included a supplementary as part of their application process. Last year, my friend got into UBC Kin with 83%, so it does play a major role.
As for SFU, 84-85% is generally a high enough for admission. From the past, science, health science and education required a percent or two higher though.
The good thing about SFU is that they post admission
cutoffs, not averages (even though that's what it says).
PS: It's funny how I'm the one who originally created this thread, and now giving advice on it