Just as Google is trying to deflect growing antitrust concerns (see previous post), its core search market share also keeps on growing. ComScore’s August search engine market share numbers came out today—via Citi analyst Mark Mahaney—and are reproduced above. Its share of U.S. search queries rose in August to 63 percent, from 61.9 percent in July. Looks like its march towards monopoly is back on track after a slight dip in June.

Meanwhile, Yahoo’s share went down nearly a point from 20.5 percent to 19.6 percent. Again, Yahoo’s loss was almost exactly Google’s gain.

Not that Microsoft is doing much better. Its U.S. search share fell from 8.9 percent to 8.3 percent. Its Live Search Cashback promotion, which accounted for only 8 percent of its searches in August (78 million out of 977 million total search queries), is still not helping stem its decline.