It would be interesting to know why some don't vote, other than the obvious of not being engaged with the election in general or they just don't bother as they don't care for any of the candidates (discussion here previously about some that choose to decline their vote).
No disrespect to anyone that chooses not to vote because they are shy, don't know how or when, but in this day and age of the Internet (or access to) for a majority of the population, it's fairly easy with a quick search to find out where and when and how to vote.
http://www.electionsmanitoba.ca/en/Voting/How
I hope people can understand how important exercising your right to vote is. Not always, but sometimes the noisiest complainers are the ones that didn't make it to the polls or just didn't bother.
Interesting question, though.