My June 2006 Dramatic Growth of Open Access Update is now available.
The Dramatic Growth of Open Access continues in the second quarter of 2006, although at a somewhat less hectic pace than the first quarter. Since I've only started noting growth on a quarterly basis beginning last December, it is possible that this reflects seasonable variation, i.e. two months of this period fall within the summer semester in the northern hemisphere, a slower time at academia in general.
Growth continued very strong in both the gold and green roads. DOAJ, today at 2,292 journals, added 134 journal titles, an increase of about 1 and 1/2 titles per day (calendar days, not business days), about an equivalent of a 25% annual increase. More than half a million items were added to an OAIster search, for a total of more than 7.6 million items, or about the equivalent of a 24% annual increase. At the current rate of growth, an OAIster search can be anticipated to encompass more than a billion items before the end of 2007.
The most significant change was a drop in the % increase to Highwire Free Press Online, from an 18% increase in the first quarter to a less than 1% increase in this quarter. It is too soon to draw any conclusions from this change, which could reflect Highwire procedural timing.
Stevan Harnad comments that a missing element is the excellent data available from ROAR, the Registry of Open Access Repositories. An excellent point, and something I'm meaning to add.