its interesting to read both of those articles, because none of the numbers match. not a single one!
depending on which one you read, google is either 65% or 66% - down 3%, or up 1%
bing is either 13% or 15% - up 1%, or unchanged
yahoo is either 15% or 13% - up half-a-percent, or down 2%
so, to summerise both articles... google is either up or down, yahoo is either up or down, and bing is either up or unchanged