This is something I have been wondering about myself. Not having attended any of the big FTO's myself I don't have first hand experience of the numbers they put through.
From OAA'S own forum, it says they start a course every month. Looking at APP course websites I guess there is about 20 per course, giving 200+ integrated folks per year. Perhaps a bit of a crude way of working a figure out but wouldn't think it could be too far off.
No idea if numbers are down at the integrated schools, but FTE Jerez are now offering Modular Flight Training again. This was suspended a couple of years ago to make way for integrated folk I believe.