US Census Bureau
When you get there, click on the data you are interested in.
US Census People
https://www.census.gov/quickfacts/fact/table/US/PST045221
Perception vs. Reality Questionnaire
Click here to test YOUR Perception vs Reality when it comes to some common real-world statistics
If you want to know if a walk in nature helps you physically - read The Healing Power of Nature by John Bascom
https://www.amazon.com/Healing-Power-Nature-exploration-well-being/dp/1457552450
Do a Bing or Google search: "what percentage of people are..." Fill in the blank...
The Internet has the answer to about any question you want answered. If you don't get the answer you want, rephrase your question.