It would be good to see the trend of website views. Regardless of how people download Postgres, at some point they do need to come to the site, e.g. for documentation or community support, etc. It would be good to see the trendline for website growth, not only as a metric of more Postgres "awareness" but we can also break down the results further and analyze what people are actually looking at on the website.
Probably a fair amount of people actually never go even to the website.
We do have google analytics data for quite a few years around somewhere. It will only track those people who don't block google analytics of course, which we're probably quite overrepresented when it comes to, but it's something.
