I get that Mark...what I'm saying is that Stats Canada, and most other statistical bureaus around the world, use seasonally adjusted numbers for a reason. A predictable cycle like spring break-up is an example of an effect on employment that they adjust for. They also adjust for things like holidays, think of the increase in spending around Christmas. They also adjust for things like calendar effects, people tend to spend more on Saturdays when they aren't at work, so they account for if there is as an example 4 or 5 Saturdays in a month. Likewise they adjust for cycles in agriculture and fishing seasons...my point was simply that there are many predictable cycles in employment, and Stats Canada uses a form of moving average to reduce the large spikes in employment numbers.
If they didn't, the trends attributable to say actual long-term growth or retraction in the labour market are more difficult to see. The seasonal effects can be very large, and could swamp longer-term trends in the data. It's signal and noise.