English: This plot displays the total contributions by registered users in terms of bytes added to all namespaces. The top most rectangle in every bar is the contribution of the newest cohort, and the rectangles below are the contributions of the cohorts ordered by increasing age. By following the same color in the graph, we can see the absolute proportion of the contributions by cohorts of a certain age. The last bar on the right is the latest data point of December 2010, and it contains a cohort rectangle for every month since January 2001; thus all colors in the rainbow gradient are visible on that bar.
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