For the most part, because people don't answer multi-page surveys. :) We know that the number of respondents is only a fraction of the total number of users on

For the most part, because people don't answer multi-page surveys. :) We know that the number of respondents is only a fraction of the total number of users on any of the platforms where the survey was posted (Slack, reddit, mailing list, web sites, etc). 2015 was the first year we had an active Slack community (and it broke to HN that year for a bit) and that drove some increases. I would caution against trying to draw any hard conclusions just from the number of respondents.