I'll try and find something. This is exercising many European countries and the UK. In some senses the UK had found a wizard wheeze to plug these gaps by importing skilled men from eastern european countries in the EU. In huge numbers. The UK was a particularly popular destination and other european countries worried about these gaps rather more (while others such as Poland and the Baltic states bemoaned their shortages due to so many moving "west"). Here in the UK there has been considerable efforts put into reviving the recruitment into trades and technical skills. My old favourite Sweden has been particularly active too, not least because unlike the UK they still have large extractive, forestry and "heavy" industry sectors. By the by the Swedes were perhaps the first to note the "split" in society between the "feminist" strata of society and the rather un feminist working class. Noting that the former consisting of "graduates" employed either in he public sector (females) or service sectors (male) lived very different lives from those in the private sector with men still in trades or various forms of industry (too many to number here) and women in the private service sector. The latter still aspiring to traditional families and without the privileges of working from home, family friendly hours or long periods off etc. This rather stark divide is discernable in a number of countries in Europe. I would think Canada is likely to mirror that sort of economic/social split, given the Country still is a major producer and contends with a harsh climate requiring a lot of maintenance and repairs).

Here in the UK the the issues about "Brexit" required EU nationals living here to register, 6 million did so. The number of adult males were well over 3 million. Had they all gone "home" I think it safe to say chunks of our economy would have ground to a halt (literally: trucks,,Lifts, Railways, Power Supplies and Ports). In a real sense these hard working skilled men saved us from ourselves.

Another interesting phenomena is the "Gender Pay Gap". Here in the UK this is available regionally. The largest pay gap by far is in the South east region, including London this is the economic engine of the UK (though as a northerner it pains me to admit it). In Northern Ireland (NI)and the North East of England the gap is usually negligible and in NI is actually in reverse some years. These are the poorest "post industrial" regions where their economies depend on public funding. As women are the majority of public employees, and jobs are at nationally agreed "rates" women are comparatively very well paid in these regions. Wales, Scotland and the other regions of England sit somewhere above these two , but still no where near the huge wage gap in the southeast. One lesson might be that prosperity and dynamism is incompatible with feminism. Certainly within the EU the smallest gaps tend to be in the poorer countries with the richest (including my faves the Swedes) having the largest gender pay gaps! Go figure!