Actually, even an economist or a statistician wouldn't be able to predict the number of kilograms of chicken that Canadians will eat 14 weeks from now. It's virtually impossible to predict exactly.
We nevertheless have some historical knowledge of consumption trends. For example, we see more consumption during the summer months. There are also periods when certain meats have more market share than their competitors, such as turkey during festive periods such as Thanksgiving. We keep track of certain factors, but we can't determine consumption to the kilogram.