When these graphs run out of room on the right side, data drops off the left
side. If the line hits the top of the graph, it means that traffic was off-scale for
that particular interval, given the current average. Off-scale surges still increase
the average line, so that eventually, the graph re-scales by itself. Compute the
number of searches for an interval by multiplying its percent with the actual
value for 100 percent, which is shown in the upper right corner.