Yup. I was surprised at that too. While a sad time for Canada, slavery wasn't as prominent here in Canada as it was elsewhere. Canada had around 4,200 slaves during that period mostly purchase from the native nations themselves. 85% of slaves were used in Quebec. France had around 250,000 during that period.

G&M also wrote an article about it back in Feb 2014, "200 years a slave: the dark history of captivity in Canada". It was based on Quebec historian Marcel Trudel's findings. 

Some additional context, PBS.org  wrote an article based on the Trans-Atlantic Slave Trade Database, edited by professors David Eltis and David Richardson. Apparently, 10.7 million Africans were shipped to the new world, but only 388,000 were shipped directly to North America (ie U.S.).