Finally, we can visualize the trends in topic growth over time (Figure \ref{763853}) by assigning each document to the highest-weighted topic. A significant number of statements (approximately 46,000) were not predicted to belong to any topic category, so we filtered these out. This could be investigated in future work – it might be noise spread out over the entire data set that could be reduced by tuning the model. We can see that after December 2018 the number of authors making data available on reasonable request (Topic 8) made a sharp increase.