When someone opens a tab, this hit is registered in the database. Once an hour we calculate the number of hits for each band as a sum of hits of all their tabs.

We then sort the bands by the number of hits in the last 2 weeks. The top band gets 100%, the other bands - the percentage of the number of hits of the top band.

For example, if we have bands X, Y and Z with 1000, 2000 and 1500 hits, the list will be:

Y - 100% (100%*2000/2000)
Z - 75% (100%*1500/2000)
X - 50% (100%*1000/2000)

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