'Booth's rule #2', often attributed to skydiving pioneer Bill Booth, states, "the safer skydiving gear becomes, the more chances skydivers will take, in order to keep the fatality rate constant".[1][47] Even though skydiving equipment has made huge leaps forward in terms of reliability, including the introduction of safety devices such as AADs, the fatality rate has stayed roughly constant when adjusted for the increasing number of participants.[48][49] This can largely be attributed to an increase in the popularity of high performance canopies, which fly much faster than traditional parachutes.[50] A greater number of landing fatalities in recent years has been attributed to high speed maneuvers close to the ground.[51]