Enrollment data: Cumulative number of people enrolled for each Software Carpentry workshop where attendance numbers were noted. N.B. Enrolment figures are somewhat imprecise: individuals that attended on day 1 but not day 2 were included, while those that attended without registration were not included. Hopefully these two effects more or less cancel out and should should not detract from the overall trend displayed.
Workshop data: Dates of all Software Carpentry workshops held to date.