Open and closed access scholarly publications in NARCIS per year of publication

This chart shows the actual number open, closed, restricted en embargoed publications (articles, doctoral theses, books, reports et cetera) in NARCIS, since 2000 (Live-data).

Open and closed access articles in NARCIS per year of publication

This chart shows the actual number of open, closed, restricted en embargoed articles in NARCIS, since 2000 (Live-data).

Open access for different scholarly publication types

This chart shows the percentage of open access publications (by universities) for a selection of different publication types available in NARCIS.
It is evident that open access differs for the different publication types. Whereas only 28.2% of articles (which form 54.7% of the publications in NARCIS) are open access, almost all PhD dissertations are openly accessible (90.3%). While the open access average of other types of publications is 41%, there are large differences between the subcategories, for example 11.9% for (legal) annotations, but 99.9% for unlabeled publications and 80 % of all lectures (Snapshot date: 01-07-2018, using publications since 2000).

Open access of PhD dissertations

This chart shows the number of PhD dissertations in NARCIS, and a total based on official VSNU-data (VSNU is the Association of Dutch universities).

A complication in the reporting of NARCIS is that not all labels for publications are applied consistently; for some universities their dissertations are labeled as "other type of publication" (because of errors in the transferchain). These dissertations can be found in NARCIS by searching for title or author, but cannot be counted in aggregation, so are missing in this chart.
The total displayed here is therefore the sum of dissertations at universities without reporting issues, and we can see NARCIS is virtually complete (there are some missing theses prior to 2006).
It can be seen nearly all dissertations are openly accessible, and when looking better it turns out that for later years embargoes are the main reason for not being open (Snapshot date: 01-07-2018).

Open access of articles

In this figure, the amount of open and closed access articles (by universities, including preprints) in NARCIS is shown. As VSNU-data (VSNU is the Association of Dutch universities) on the total amount of articles (according to the EduStandaard definition) was not available all years, we cannot fully compare the amount of articles in NARCIS to the total amount of articles according to the VSNU. To provide an estimation of the completeness of NARCIS, we show the total amount of research output, along with the number of articles since 2008, and an estimation of the number of articles using the NARCIS content as well as the total VSNU output (Snapshot date: 01-07-2018).

Open access of articles across Dutch universities

In the last plot, the ratio between the number of open access articles (including preprints) and the total number of articles (based on the data by the VSNU, the Association of Dutch universities, and an estimate for earlier years) is shown for the different Dutch universities. Although this figure reflects an estimation rather than the true ratio of open access articles per university, it can give an impression of the individual differences between Dutch universities. While for some universities the number of open access articles in NARCIS is increasing relatively rapidly, other universities show a slower (or no) increase. There are several potential explanations for the observed differences between universities. On the one hand, differences may reflect true deviations in the number of open access articles between universities. On the other hand, differences are also caused by deviations in the completeness of the information that the different universities (can) provide to NARCIS (Snapshot date: 01-07-2018).

NARCIS provides access to (open access) publications from the repositories of all the Dutch universities, KNAW, NWO and a number of research institutes. Some institutes have all their scholarly publications included in the repository, others only the open access publications.