1975. The answer to your question is hard to quantify. In the past 9 years that I have known CV the entry qualifications have varied enormously. In the early 00s when CV was in a time of rapid expansion then there were quite a few turboproppers employed but this was in a time when there were not so many pilots looking for jobs. This applied particularly to the military Transall guys and there are quite a number now who are Captains or SFOs approaching upgrade. Latterly, to my knowledge, only guys with jet time have been employed. As we all know there is a shortage of jobs so the company can be more selective and clearly if you are looking for someone to crew a 4 engined heavy then jet time is more desirable.
Also during the expansion, times to command could be no more than 2.5 years for those with the right experience. Bear in mind that this has now lengthened to 10 - 15 years if you are lucky and you will see why younger pilots are usually employed – in the 00s age at hiring was anywhere between mid 20s and mid 40s, the latter would in all likelihood now be permanent F/Os.
The back ground of recruits is varied and include many from charter carriers, current and defunct, bankrupt companies (SN and LX/SR in the past), those returning from the sandpit/far east and those who cannot see a career in the LoCos doing 900 hours shorthaul a year until retirement.
However, if you meet the requirements posted on the website then don’t be put off applying, you never know your luck.