Canada's apprenticeship system writ large has approximately 250,000 people currently registered. That includes construction, hairstylists, bakers, anything that's considered a registered Red Seal trade. There are about a quarter of a million folks, and each year Statistics Canada says there are 25,000 to 30,000 people who graduate from the apprentice program.
Apprentice programs differ in their length. For a specialty welder, it's four years, and for a carpenter, it's three. For a heavy machinery operator, it may be two or three years. In Canada's apprentice system, of which construction is a part, there are 20,000-odd folks graduating from their field of study, so to speak.
Basically, 10% of the entire apprenticeship system is in construction, and it's in Alberta. If you talk to some of the industrial unions or manufacturing trades, they haven't been able to hire apprentices in a long, long time because there's been a contraction in those sectors. The construction trades and companies, by opposite logic, have been able to hire tons of apprentices; it's usually three or four apprentices per journeyperson in the workplace.