Google continues to dominate the search engine market in the US, and managed to increase its share by another percentage point in June, meaning it now has an almost 70% share of searches.

While Google’s share has been increasing, that of its rivals has decreased, especially when you look at the year on year figures.

According to Hitwise, while Google’s share of searches has increased from 63.9% in June 2007 to 69.1% in June this year, Yahoo’s share has dropped from 21.3% to 19.6% over the same period, while MSN has fallen more dramatically, from 9.8% to 5.4%. The only search engine not to see its market share drop was Ask.com.

The remaining 42 search engines in the US market accounted for a combined total of just 1.7% of searches, a fact which highlights the uphill task which any new search engine has to break into the market.

Hitwise also looked at search market share in the UK last month. Here, Google is even more dominant, accounting for 87.3% of all searches, only slightly more than May, but a significant increase on June 2007, when it had 79.5% of the market.

As in the US market, Google seems to have eaten up the market share of rival search engines. Yahoo’s share of UK searches has fallen from 7.7% to 4% year on year, MSN from 5.7% to 3.7, and Ask.com from 4.6% in June 2007 to 3.1% last month.