Nielsen Online today released its rankings of U.S. search share for March (PDF), with overall search increasing 16.7 percent year over year to 9.5 billion searches. Google had a year over year increase of 27.6 percent and received 64.2 percent of searches. Google’s had it highest percentage of searches ever, surpassing November of last year when it received 64.1 percent. Yahoo had a year over year increase of 1.7 percent and received 15.8 percent of searches. Yahoo’s percentage of searches was lower that 16 percent for the first time in the last two years and was 6.1 percentage points lower than it highest percentage in the last two years. Microsoft had a year over year increase of 0.3 percent and received 10.3 percent of searches.