"Despite the anomalous activity of - probably sole - HPUX user grabbing an eyeful of 18 pages per visit, by far the majority of the site's visitors - 98.8 per cent of the visits in a given month - do so on Windows PCs. Mac users come second - clearly they're thoughtful lovers - scoring five per cent. Linux lads are next, accounting for 0.7 per cent of site visits."

98.8 + 5 + 0.7= 104.5%

Clearly some top grade maths going on here.