At first glance, it looks like Bing has lost 5 percentage points of market share, but the "-5%" represents a 5% decline in its share. It dropped from 16.96% to 16.38% (not 16.96% to 11.96%).

We should note that Ask.com deserves some credit for increasing its search share by 8% (from 2.37% to 2.56%).

Of course, this could be a blip"or perhaps Bings earlier growth was the blip"but whats you take on this reversal of good fortunes?