The number of English Language Wikipedia articles in a sample of 1001 taken in December 2015 that are in several categories (biographies, geographic articles, etc.) "Time" on the X axis is uneven and shows when the articles in the sample were begun. The time categories represent approximately the number of articles in En Wikipedia: before 2006 the 1st million articles were written, 2006-2007 the 2nd million articles were written, etc