This list is Voynich-centric, and far from complete (and these are personal files, so they are not double-checked), so it may not provide much general information about parchment/paper, but it does give a sense of when paper became more common, and includes the dimensions when the information was available (when I remembered to record it).
Paper starts showing up with more frequency c. 1330s. By the mid-1400s, paper was much more common, by the late 1400s, parchment was becoming less common:
Paper starts showing up with more frequency c. 1330s. By the mid-1400s, paper was much more common, by the late 1400s, parchment was becoming less common:


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