All Report are available https://pdf4wcag.com/blog-news/

We only determined the technical characteristics of the documents.

PDF file sizes follow an approximately log-normal distribution, making logarithmic visualization and median-based statistics more appropriate than arithmetic averages. Median file size increased steadily until approximately 2021, after which growth flattened and became slightly negative. Quadratic regression confirms that this slowdown is highly statistically significant. The evidence suggests that the typical PDF published on the web has not become substantially larger over time. Despite initial guesses, Tagged PDFs turn out to be smaller in average than Untagged ones. https://pdf4wcag.com/blog-news/analysis-pdf-file-size