from a general survey point of view, there are confounding aspects to a single number like that. Since Java is an enterprise language by design, the difference between 'moving versions due to management declaration' and 'our major ecosystem component supports THIS' also factor in to the overall picture.

As an outsider who does follow this for editorial reasons from time to time, most recent info (last year) was yes, projects surveyed are staying on (open) version 8.