The National Parks had a saying that 95% of the visitors use 5% of the space. We sort of changed that to "the 5% rule" that basically 95% of any outdoor group uses 5%, so :
only 5% will hike
only 5% of those will hike off trail
only 5% of those will climb
etc, so that even in a park like Yosemite, you only meet a VERY tiny number of people in the backcountries unused trails and open space.
maybe 5% of hikers camp
maybe 5% of those winter camp.