The cheapest version: a simple Google Forms survey is general information, not solid evidence for precise percentages.
When I ask 78 people at the market if they like carbonara pasta, I cannot say that 75% of Italians prefer this dish; it's just a rough indication.
For such definitive figures on traveler behavior, a more large and controlled study is needed, not a small sample.
Relying on this for important decisions is taking unnecessary risks.