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  1. Jun 2016
    1. Results of our analysis show that there has been a consistent growth in the number of articles published over the past decade; from 1.3 million in 2003 to 2.4 million in 2013 (see Figure 1). At the same time, the number of authorships has increased at a far greater rate from 4.6 million in 2003 to 10 million in 2013.

      authorships are growing at a much faster rate than articles (though interestingly, "unique authors" are also growing at a faster rate than authors... though I think what they mean is the number of unique individuals identified as authors, however many times they are identified (= unique authors) vs. "number of names appearing in bylines (=authorships).