It is reported that in 1989 some 50,000 people in the United States dared to take part in this sport; more recently an estimated half - million are drawn by its fatal attraction.
1989. aastal harrastas Ameerika Ühendriikides seda spordiala umbes 50 000 inimest, hiljutiste teadete kohaselt on selle eluohtliku alaga tegelejaid juba ligikaudu pool miljonit.