I am wondering if anybody can help

I am researching mac market share. I can find plenty of info on Macs world market share, but am more interested in their share of the consumer market - taking out the business sector which generally buy PCs.

I am particularly interested in Macs in the home and education, in the USA and also europe

Anybody know of any good links, I am trying to put a case together to a company who don't support Macs with their satnav devices and I need to show that consumers who use macs may not be just 4-5% of the market