By 1957 the FBI top ten fugitives list had reached a level of stability not seen again until several decades later. Since the list was limited to only ten fugitives at a time, the list had become more populated by long-timers, as new captures were becoming more difficult and infrequent. As a result of the low turnover rate, at only four new additions in 1957, that year had now surpassed the prior year as the shortest list of new top tenners added by the FBI in a single year up to that time.