R ... I've been following this thread with interest, and you really have been given some very good advice, but I don't think there is an easy way of obtaining the information that you are seeking.
For the last 20 years I've been researching those who worked in the UK sugar refining industry, and I've built up a mass of information regarding the local workers, the migrant workers and the cities/towns where they lived and worked. There are similarities between the two industries ... local money, migrant skills, local and migrant labour, imported (slave trade) raw materials, early beginnings (sugar mid-1500s), 1800s peak, 1900s decline ... and I feel that there would also be a similarity in the research needed.
For sugar refining there was no trade body, no livery company. Company records and employee records have been destroyed. So my information has come from a huge number of general sources ... church/parish registers, censuses, trade directories, ships/migration lists, wills and probate calendars, burgess records, apprentice records, newspapers/periodicals, insurance records, books, archaeological reports, parliamentary records, local archives, family histories, etc ... and other folks' research and good will.
If the statistics are not available you may have to set about providing them yourself ... hard work but very rewarding. Good luck.