You have roughly 10,000 changes that happen in any given day. The accuracy of the list evolves as we get closer to the election. At the time we began the last election, the accuracy was around 91.5%, and it ended up around 94.5%.
Based on the number of activities we're doing right now, I'm quite optimistic that we will be at a higher level when we start this election than in the last one, but it's something we'll have to measure then.