See figure 1.3a - https://www.gov.uk/government/publications/migration-advisor...
Note that to the best of my knowledge, these numbers don't include the Afghan resettlement scheme which would further lower the proportion of employment driven visas.
That's what pisses me off about the whole thing. People buy the crap the politicians are feeding them and the immigrants are the ones that pay for it. You'd think people would have realized after decades of this crap that neither party is going to do a damn thing.