@Twiglets1
Most answers are experts' assessments
These are western experts, presumably, and the problem we have is that half the world don't agree with them
Some answers are provided by public-opinion surveys from the respective countries. In the case of countries for which survey results are missing, survey results for similar countries and expert assessments are used in order to fill in gaps.
The surveys I have seen from "not democratic" countries generally take a sample of around 0.07 to send request out to and even if only a few reply will take that; or on a self selected group, so the answers are nowhere near reliable. I am not saying right or wrong, but nowhere near reliable. And who decides which is a "similar" country?
I do think it is interesting that the UK is seen as more democratic than Isreal and US. Though even as I write that (as someone from the UK) I can't help wry laughter!! Aren't most western democracies failing states now?