Thanks to Jim Till on Be Openly Accessible or Be Obscure for More (and better!) Baseline Data from PubMed.
Jim's data, dated April 6, 2008 - the day before the NIH new public access requirement took effect:
Some other data about the percentage of freely-accessible articles, obtained on the same day using the same key words:
Published within the last 2 years: 44366/144166=31%
Published within the last 1 year: 12241/67486=18%
Published within the last 180 days: 3894/30602=13%
Published within the last 90 days: 1012/11947=8%
Published within the last 60 days: 454/6475=7%
Published within the last 30 days: 143/2267=6%
As Jim points out, when the effects of the NIH mandate begin to be seen, these percentages are expected to rise dramatically!
What a great way to kick off OA Week, in recognition of the NIH mandate policy.
This post is part of the Dramatic Growth of Open Access Series.
