Comparison of OA rates obtained by supplementary surveys and the main survey.

<p>PRF: Pls confirm that vertically merged cells and diagonal lines are correctly formatted.</p

Number of sample articles for each survey.

<p>Number of sample articles for each survey.</p

Rising percentage of OA.

<p>Rising percentage of OA.</p

Transitionin OA provision methods.^*

<p>* Because multiple OA sources for each article were counted, the percentages for each year add up to more than 100%.</p